Source Code

These source-code files are part of a reconstructed copy of Luminary 69/2, the flown, final release of the Apollo 10 Lunar Module (LM) Apollo Guidance Computer (AGC) software.

The reconstruction is based on the source code of Luminary 69 — i.e., the initial, unflown version, "revision 0" — of which a contemporary listing was available. The code was then updated by incorporating the differences between Luminary 69 and Luminary 69/2, known from other contemporary documentation. The only such difference is the implementation in Luminary 69/2 of the "R-2 Lunar Potential Model", the source code for which was taken from program Luminary 99/1 (Apollo 11 LM), of which a contemporary listing was also available. Finally, the now-reconstructed Luminary 69/2 was then validated by assembling it to executable form and verifying that its memory banks had the correct checksums, known from still other contemporary documentation.

Note that page numbers in the reconstructed code match those in the original Luminary 69 program listing, or in the ORBITAL INTEGRATION log section, in Luminary 99/1. Page numbers would certainly differ somewhat in a contemporary Luminary 69/2 listing. Moreover, annotations that were not present in the contemporary source code have been added to the reconstructed code to justify each change in Luminary 69/2 relative to Luminary 69. Here's a guide to the Apollo documentation referenced in those annotations:
Comments from the original source code are prefixed with a single '#' symbol, whereas comments added later are prefixed by "##" or "###". Report any errors noted by creating an issue report at the Virtual AGC project's GitHub repository.

048671,000002:                                                                                                  ## Copyright:   Public domain.
048672,000003:                                                                                                  ## Filename:    PLANETARY_INERTIAL_ORIENTATION.agc
048673,000004:                                                                                                  ## Purpose:     A section of LUM69 revision 2.
048674,000005:                                                                                                  ##              It is part of the reconstructed source code for the flown
048675,000006:                                                                                                  ##              version of the flight software for the Lunar Module's (LM)
048676,000007:                                                                                                  ##              Apollo Guidance Computer (AGC) for Apollo 10. The code has
048677,000008:                                                                                                  ##              been recreated from a copy of Luminary revsion 069, using
048678,000009:                                                                                                  ##              changes present in Luminary 099 which were described in
048679,000010:                                                                                                  ##              Luminary memos 75 and 78. The code has been adapted such
048680,000011:                                                                                                  ##              that the resulting bugger words exactly match those specified
048681,000012:                                                                                                  ##              for LUM69 revision 2 in NASA drawing 2021152B, which gives
048682,000013:                                                                                                  ##              relatively high confidence that the reconstruction is correct.
048683,000014:                                                                                                  ## Reference:   pp. 1135-1143
048684,000015:                                                                                                  ## Assembler:   yaYUL
048685,000016:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
048686,000017:                                                                                                  ## Website:     www.ibiblio.org/apollo/index.html
048687,000018:                                                                                                  ## Mod history: 2019-07-27 MAS  Created from Luminary 69.
048688,000019: 

Page 1135

048690,000021:                                                                                                  #  ..... RP-TO-R SUBROUTINE .....
048691,000022:                                                                                                  #  SUBROUTINE TO CONVERT RP (VECTOR IN PLANETARY COORDINATE SYSTEM, EITHER
048692,000023:                                                                                                  #   EARTH-FIXED OR MOON-FIXED) TO R (SAME VECTOR IN THE BASIC REF. SYSTEM)
048693,000024: 
048694,000025:                                                                                                  #        R = MT(T)*(RP + LP X RP)        MT = M MATRIX TRANSPOSE
048695,000026: 
048696,000027:                                                                                                  #  CALLING SEQUENCE
048697,000028:                                                                                                  #        L       CALL
048698,000029:                                                                                                  #        L+1             RP-TO-R
048699,000030: 
048700,000031:                                                                                                  #  SUBROUTINES USED
048701,000032:                                                                                                  #        EARTHMX,MOONMX,EARTHL
048702,000033: 
048703,000034:                                                                                                  #        ITEMS AVAILABLE FROM LAUNCH DATA
048704,000035:                                                                                                  #                504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL,EXPRESSED
048705,000036:                                                                                                  #                        IN THE MOON-FIXED COORD. SYSTEM         RADIANS B0
048706,000037: 
048707,000038:                                                                                                  #        ITEMS NECESSARY FOR SUBR. USED (SEE DESCRIPTION OF SUBR.)
048708,000039: 
048709,000040:                                                                                                  #  INPUT
048710,000041:                                                                                                  #        MPAC= 0 FOR EARTH, NON-ZERO FOR MOON
048711,000042:                                                                                                  #        0-5D= RP VECTOR
048712,000043:                                                                                                  #        6-7D= TIME
048713,000044: 
048714,000045:                                                                                                  #  OUTPUT
048715,000046:                                                                                                  #        MPAC = R VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
048716,000047: 
048717,000048: 24,2000                                           SETLOC   PLANTIN                               
048718,000049: 24,2000                                           BANK                                           
048719,000050: 
048720,000051: 24,3504                                           COUNT*   $$/LUROT                              
048721,000052: 
048722,000053: 24,3504           46020        RP-TO-R            STQ      BHIZ                                  
048723,000054: 24,3505           00050                                    RPREXIT                               
048724,000055: 24,3506           51521                                    RPTORA                                
048725,000056: 24,3507           77624                           CALL                                           #  COMPUTE M MATRIX FOR MOON
048726,000057: 24,3510           51561                                    MOONMX                                #  LP=LM FOR MOON  RADIANS B0
048727,000058: 24,3511           77775                           VLOAD                                          
048728,000059: 24,3512           02013                                    504LM                                 
048729,000060: 24,3513           53235        RPTORB             VXV      VAD                                   
048730,000061: 24,3514           00001                                    504RPR                                
048731,000062: 24,3515           00001                                    504RPR                                
048732,000063: 24,3516           52105                           VXM      GOTO                                  
048733,000064: 24,3517           00025                                    MMATRIX                               #  MPAC=R=MT(T)*(RP+LPXRP)
048734,000065: 24,3520           51547                                    RPRPXXXX                              #  RESET PUSHLOC TO 0 BEFORE EXITING
048735,000066: 24,3521           77624        RPTORA             CALL                                           #  EARTH COMPUTATIONS
048736,000067: 24,3522           55657                                    EARTHMX                               #  M MATRIX B-1
048737,000068: 24,3523           77624                           CALL                                           
048738,000069: 24,3524           55711                                    EARTHL                                #  L VECTOR RADIANS B0
048739,000070: 24,3525           76521                           MXV      VSL1                                  #  LP=M(T)*L  RAD B-0
048740,000071: 24,3526           00025                                    MMATRIX                               

Page 1136

048742,000073: 24,3527           77650                           GOTO                                           
048743,000074: 24,3530           51513                                    RPTORB                                
048744,000075: 

Page 1137

048746,000077:                                                                                                  #  ..... R-TO-RP SUBROUTINE .....
048747,000078:                                                                                                  #  SUBROUTINE TO CONVERT R (VECTOR IN REFERENCE COORD. SYSTEM) TO RP
048748,000079:                                                                                                  #  (VECTOR IN PLANETARY COORD SYSTEM) EITHER EARTH-FIXED OR MOON-FIXED
048749,000080: 
048750,000081:                                                                                                  #        RP = M(T)*(R - L X R)
048751,000082: 
048752,000083:                                                                                                  #  CALLING SEQUENCE
048753,000084:                                                                                                  #        L       CALL
048754,000085:                                                                                                  #        L+1             R-TO-RP
048755,000086: 
048756,000087:                                                                                                  #  SUBROUTINES USED
048757,000088:                                                                                                  #        EARTHMX,MOONMX,EARTHL
048758,000089: 
048759,000090:                                                                                                  #  INPUT
048760,000091:                                                                                                  #        MPAC= 0 FOR EARTH,NON-ZERO FOR MOON
048761,000092:                                                                                                  #        0-5D= R VECTOR
048762,000093:                                                                                                  #        6-7D= TIME
048763,000094: 
048764,000095:                                                                                                  #        ITEMS AVAILABLE FROM LAUNCH DATA
048765,000096:                                                                                                  #                504LM = THE LIBRATION VECTOR L OF THE MOON AT TIME TIMSUBL,EXPRESSED
048766,000097:                                                                                                  #                        IN THE MOON-FIXED COORD. SYSTEM   RADIANS B0
048767,000098: 
048768,000099:                                                                                                  #        ITEMS NECESSARY FOR SUBROUTINES USED (SEE DESCRIPTION OF SUBR.)
048769,000100: 
048770,000101:                                                                                                  #  OUTPUT
048771,000102:                                                                                                  #        MPAC = RP VECTOR METERS B-29 FOR EARTH, B-27 FOR MOON
048772,000103: 
048773,000104: 24,3531           46020        R-TO-RP            STQ      BHIZ                                  
048774,000105: 24,3532           00050                                    RPREXIT                               
048775,000106: 24,3533           51553                                    RTORPA                                
048776,000107: 24,3534           77624                           CALL                                           
048777,000108: 24,3535           51561                                    MOONMX                                
048778,000109: 24,3536           61375                           VLOAD    VXM                                   
048779,000110: 24,3537           02013                                    504LM                                 #  LP=LM
048780,000111: 24,3540           00025                                    MMATRIX                               
048781,000112: 24,3541           77772                           VSL1                                           #   L=MT(T)*LP  RADIANS B0
048782,000113: 24,3542           51235        RTORPB             VXV      BVSU                                  
048783,000114: 24,3543           00001                                    504RPR                                
048784,000115: 24,3544           00001                                    504RPR                                
048785,000116: 24,3545           77721                           MXV                                            #  M(T)*(R-LXR) B-2
048786,000117: 24,3546           00025                                    MMATRIX                               
048787,000118: 24,3547           40372        RPRPXXXX           VSL1     SETPD                                 
048788,000119: 24,3550           00001                                    0D                                    
048789,000120: 24,3551           77650                           GOTO                                           
048790,000121: 24,3552           00050                                    RPREXIT                               
048791,000122: 24,3553           77624        RTORPA             CALL                                           #  EARTH COMPUTATIONS
048792,000123: 24,3554           55657                                    EARTHMX                               
048793,000124: 24,3555           77624                           CALL                                           
048794,000125: 24,3556           55711                                    EARTHL                                
048795,000126: 24,3557           77650                           GOTO                                           #  MPAC=L=(-AX,-AY,0) RAD B-0
048796,000127: 24,3560           51542                                    RTORPB                                
048797,000128: 

Page 1138

048799,000130:                                                                                                  #  ..... MOONMX SUBROUTINE .....
048800,000131:                                                                                                  #  SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE MOON
048801,000132: 
048802,000133:                                                                                                  #  CALLING SEQUENCE
048803,000134:                                                                                                  #        L       CALL
048804,000135:                                                                                                  #        L+1             MOONMX
048805,000136: 
048806,000137:                                                                                                  #  SUBROUTINES USED
048807,000138:                                                                                                  #        NEWANGLE
048808,000139: 
048809,000140:                                                                                                  #  INPUT
048810,000141:                                                                                                  #        6-7D= TIME
048811,000142: 
048812,000143:                                                                                                  #        ITEMS AVAILABLE FROM LAUNCH DATA
048813,000144:                                                                                                  #                BSUBO,BDOT
048814,000145:                                                                                                  #                TIMSUBO,NODIO,NODDOT,FSUBO,FDOT
048815,000146:                                                                                                  #                COSI= COS(I)    B-1
048816,000147:                                                                                                  #                SINI= SIN(I)    B-1
048817,000148:                                                                                                  #                  I IS THE ANGLE BETWEEN THE MEAN LUNAR EQUATORIAL PLANE AND THE
048818,000149:                                                                                                  #                  PLANE OF THE ECLIPTIC (1 DEGREE 32.1 MINUTES)
048819,000150: 
048820,000151:                                                                                                  #  OUTPUT
048821,000152:                                                                                                  #        MMATRIX= 3X3 M MATRIX B-1       (STORED IN VAC AREA)
048822,000153: 
048823,000154: 24,3561           40220        MOONMX             STQ      SETPD                                 
048824,000155: 24,3562           00051                                    EARTHMXX                              
048825,000156: 24,3563           00011                                    8D                                    
048826,000157: 24,3564           77770                           AXT,1                                          #  B REQUIRES SL 0, SL 5 IN NEWANGLE
048827,000158: 24,3565           00005                                    5                                     
048828,000159: 24,3566           65345                           DLOAD    PDDL                                  #  PD 10D        8-9D=BSUBO
048829,000160: 24,3567           10017                                    BSUBO                                 #                10-11D=BDOT
048830,000161: 24,3570           10011                                    BDOT                                  
048831,000162: 24,3571           45006                           PUSH     CALL                                  #  PD 12D
048832,000163: 24,3572           51706                                    NEWANGLE                              #  EXIT WITH PD 8D AND MPAC= B   REVS B0
048833,000164: 24,3573           71406                           PUSH     COS                                   #  PD 10D
048834,000165: 24,3574           14041                           STODL    COB                                   #  PD 8D         COS(B) B-1
048835,000166: 24,3575           77756                           SIN                                            #                SIN(B) B-1
048836,000167: 24,3576           14043                           STODL    SOB                                   #  SETUP INPUT FOR NEWANGLE
048837,000168: 24,3577           10015                                    FSUBO                                 #                        8-9D=FSUBO
048838,000169: 24,3600           41525                           PDDL     PUSH                                  #  PD 10D THEN 12D       10-11D=FDOT
048839,000170: 24,3601           10007                                    FDOT                                  
048840,000171: 24,3602           45170                           AXT,1    CALL                                  #  F REQUIRES SL 1, SL 6 IN NEWANGLE
048841,000172: 24,3603           00004                                    4                                     
048842,000173: 24,3604           51706                                    NEWANGLE                              #  EXIT WITH PD 8D AND MPAC= F REVS B0
048843,000174: 24,3605           14027                           STODL    AVECTR     +2                         #  SAVE F TEMP
048844,000175: 24,3606           10013                                    NODIO                                 #                        8-9D=NODIO
048845,000176: 24,3607           41525                           PDDL     PUSH                                  #  PD 10D THEN 12D       10-11D=NODDOT
048846,000177: 24,3610           10005                                    NODDOT                                #                        MPAC=T
048847,000178: 24,3611           45170                           AXT,1    CALL                                  #  NODE REQUIRES SL 0, SL 5 IN NEWANGLE
048848,000179: 24,3612           00005                                    5                                     
048849,000180: 24,3613           51706                                    NEWANGLE                              #  EXIT WITH PD 8D AND MPAC= NODI REVS B0

Page 1139

048851,000182: 24,3614           71406                           PUSH     COS                                   #  PD 10D        8-9D= NODI REVS B0
048852,000183: 24,3615           77606                           PUSH                                           #  PD 12D        10-11D= COS(NODI) B-1
048853,000184: 24,3616           00025                           STORE    AVECTR                                
048854,000185: 24,3617           76405                           DMP      SL1R                                  
048855,000186: 24,3620           00041                                    COB                                   #                         COS(NODI) B-1
048856,000187: 24,3621           14035                           STODL    BVECTR     +2                         #  PD 10D  20-25D=AVECTR= COB*SIN(NODI)
048857,000188: 24,3622           76405                           DMP      SL1R                                  #                         SOB*SIN(NODI)
048858,000189: 24,3623           00043                                    SOB                                   
048859,000190: 24,3624           14037                           STODL    BVECTR     +4                         #  PD 8D
048860,000191: 24,3625           41556                           SIN      PUSH                                  #  PD 10D                -SIN(NODI) B-1
048861,000192: 24,3626           77676                           DCOMP                                          #          26-31D=BVECTR= COB*COS(NODI)
048862,000193: 24,3627           14033                           STODL    BVECTR                                #  PD 8D                  SOB*COS(NODI)
048863,000194: 24,3630           00027                                    AVECTR     +2                         #  MOVE F FROM TEMP LOC. TO 504F
048864,000195: 24,3631           14007                           STODL    504F                                  
048865,000196: 24,3632           76405                           DMP      SL1R                                  
048866,000197: 24,3633           00041                                    COB                                   
048867,000198: 24,3634           14027                           STODL    AVECTR     +2                         
048868,000199: 24,3635           00011                                    SINNODI                               #  8-9D=SIN(NODI) B-1
048869,000200: 24,3636           76405                           DMP      SL1R                                  
048870,000201: 24,3637           00043                                    SOB                                   
048871,000202: 24,3640           14031                           STODL    AVECTR     +4                         #                         0
048872,000203: 24,3641           06424                                    HI6ZEROS                              #        8-13D= CVECTR= -SOB  B-1
048873,000204: 24,3642           57525                           PDDL     DCOMP                                 #  PD 10D                COB
048874,000205: 24,3643           00043                                    SOB                                   
048875,000206: 24,3644           63325                           PDDL     PDVL                                  #  PD 12D THEN PD 14D
048876,000207: 24,3645           00041                                    COB                                   
048877,000208: 24,3646           00033                                    BVECTR                                
048878,000209: 24,3647           63361                           VXSC     PDVL                                  #  PD 20D        BVECTR*SINI  B-2
048879,000210: 24,3650           10003                                    SINI                                  
048880,000211: 24,3651           00011                                    CVECTR                                
048881,000212: 24,3652           53361                           VXSC     VAD                                   #  PD 14D        CVECTR*COSI  B-2
048882,000213: 24,3653           10001                                    COSI                                  
048883,000214: 24,3654           77772                           VSL1                                           
048884,000215: 24,3655           24041                           STOVL    MMATRIX    +12D                       #  PD 8D  M2=BVECTR*SINI+CVECTR*COSI  B-1
048885,000216: 24,3656           63361                           VXSC     PDVL                                  #  PD 14D
048886,000217: 24,3657           10003                                    SINI                                  #                CVECTR*SINI  B-2
048887,000218: 24,3660           00033                                    BVECTR                                
048888,000219: 24,3661           52361                           VXSC     VSU                                   #  PD 8D         BVECTR*COSI  B-2
048889,000220: 24,3662           10001                                    COSI                                  
048890,000221: 24,3663           65372                           VSL1     PDDL                                  #  PD 14D
048891,000222: 24,3664           00007                                    504F                                  #  8-13D=DVECTR=BVECTR*COSI-CVECTR*SINI  B-1
048892,000223: 24,3665           74346                           COS      VXSC                                  
048893,000224: 24,3666           00011                                    DVECTR                                
048894,000225: 24,3667           73525                           PDDL     SIN                                   #  PD 20D  14-19D= DVECTR*COSF  B-2
048895,000226: 24,3670           00007                                    504F                                  
048896,000227: 24,3671           52361                           VXSC     VSU                                   #  PD 14D          AVECTR*SINF  B-2
048897,000228: 24,3672           00025                                    AVECTR                                
048898,000229: 24,3673           77772                           VSL1                                           
048899,000230: 24,3674           14033                           STODL    MMATRIX    +6                         #  M1= AVECTR*SINF-DVECTR*COSF  B-1
048900,000231: 24,3675           00007                                    504F                                  

Page 1140

048902,000233: 24,3676           74356                           SIN      VXSC                                  #  PD 8D
048903,000234: 24,3677           71525                           PDDL     COS                                   #  PD 14D  8-13D=DVECTR*SINF B-2
048904,000235: 24,3700           00007                                    504F                                  
048905,000236: 24,3701           53361                           VXSC     VAD                                   #  PD 8D         AVECTR*COSF B-2
048906,000237: 24,3702           00025                                    AVECTR                                
048907,000238: 24,3703           57572                           VSL1     VCOMP                                 
048908,000239: 24,3704           34025                           STCALL   MMATRIX                               #  M0= -(AVECTR*COSF+DVECTR*SINF)  B-1
048909,000240: 24,3705           00051                                    EARTHMXX                              
048910,000241: 
048911,000242:                                                                                                  #  COMPUTE X=X0+(XDOT)(T+T0)
048912,000243:                                                                                                  #  8-9D= XO (REVS B-0), PUSHLOC SET AT 12D
048913,000244:                                                                                                  #  10-11D=XDOT (REVS/CSEC) SCALED B+23 FOR WEARTH,B+28 FOR NODDOT AND BDOT
048914,000245:                                                                                                  #                        AND B+27 FOR FDOT
048915,000246:                                                                                                  #   X1=DIFFERENCE IN 23 AND SCALING OF XDOT,=0 FOR WEARTH,5 FOR NODDOT AND
048916,000247:                                                                                                  #                                        BDOT AND 4 FOR FDOT
048917,000248:                                                                                                  #  6-7D=T (CSEC B-28), TIMSUBO= (CSEC B-42 TRIPLE PREC.)
048918,000249: 
048919,000250: 24,3706           54345        NEWANGLE           DLOAD    SR                                    #  ENTER PD 12D
048920,000251: 24,3707           00007                                    6D                                    
048921,000252: 24,3710           20617                                    14D                                   
048922,000253: 24,3711           72371                           TAD      TLOAD                                 #  CHANGE MODE TO TP
048923,000254: 24,3712           01707                                    TIMSUBO                               
048924,000255: 24,3713           00155                                    MPAC                                  
048925,000256: 24,3714           14017                           STODL    TIMSUBM                               #  T+T0 CSEC B-42
048926,000257: 24,3715           00020                                    TIMSUBM    +1                         
048927,000258: 24,3716           77605                           DMP                                            #  PD 10D        MULT BY XDOT IN 10-11D
048928,000259: 24,3717           43257                           SL*      DAD                                   #  PD 8D         ADD XO IN 8-9D AFTER SHIFTING
048929,000260: 24,3720           20206                                    5,1                                   #                SUCH THAT SCALING IS B-0
048930,000261: 24,3721           67206                           PUSH     SLOAD                                 #  PD 10D  SAVE PARTIAL (X0+XDOT*T) IN 8-9D
048931,000262: 24,3722           00017                                    TIMSUBM                               
048932,000263: 24,3723           41261                           SL       DMP                                   
048933,000264: 24,3724           20212                                    9D                                    
048934,000265: 24,3725           00013                                    10D                                   #  XDOT
048935,000266: 24,3726           43257                           SL*      DAD                                   #  PD 8D         SHIFT SUCH THAT THIS PART OF X
048936,000267: 24,3727           20213                                    10D,1                                 #                IS SCALED REVS/CSEC B-0
048937,000268: 24,3730           77600                           BOV                                            #  TURN OFF OVERFLOW IF SET BY SHIFT
048938,000269: 24,3731           51732                                    +1                                    #  INSTRUCTION BEFORE EXITING
048939,000270: 24,3732           77616                           RVQ                                            #  MPAC=X= X0+(XDOT)(T+T0)  REVS B0
048940,000271: 

Page 1141

048942,000273:                                                                                                  #  ..... EARTHMX SUBROUTINE .....
048943,000274:                                                                                                  #  SUBROUTINE TO COMPUTE THE TRANSFORMATION MATRIX M FOR THE EARTH
048944,000275: 
048945,000276:                                                                                                  #  CALLING SEQUENCE
048946,000277:                                                                                                  #        L       CALL
048947,000278:                                                                                                  #        L+1             EARTHMX
048948,000279: 
048949,000280:                                                                                                  #  SUBROUTINES USED
048950,000281:                                                                                                  #        NEWANGLE
048951,000282: 
048952,000283:                                                                                                  #  INPUT
048953,000284:                                                                                                  #        INPUT AVAILABLE FROM LAUNCH DATA        AZO  REVS B-0
048954,000285:                                                                                                  #                                                TEPHEM  CSEC B-42
048955,000286:                                                                                                  #        6-7D= TIME CSEC B-28
048956,000287: 
048957,000288:                                                                                                  #  OUTPUT
048958,000289:                                                                                                  #        MMATRIX= 3X3 M MATRIX B-1       (STORED IN VAC AREA)
048959,000290: 
048960,000291: 26,3657                                           BANK     26                                    
048961,000292: 26,2000                                           SETLOC   PLANTIN1                              
048962,000293: 26,2000                                           BANK                                           
048963,000294: 26,3657                                           COUNT*   $$/LUROT                              
048964,000295: 
048965,000296: 26,3657           40220        EARTHMX            STQ      SETPD                                 #  SET 8-9D=AZO
048966,000297: 26,3660           00051                                    EARTHMXX                              
048967,000298: 26,3661           00011                                    8D                                    #  10-11D=WEARTH
048968,000299: 26,3662           77770                           AXT,1                                          #  FOR SL 5, AND SL 10 IN NEWANGLE
048969,000300: 26,3663           00000                                    0                                     
048970,000301: 26,3664           65345                           DLOAD    PDDL                                  #  LEAVING PD SET AT 12D FOR NEWANGLE
048971,000302: 26,3665           01712                                    AZO                                   
048972,000303: 26,3666           10021                                    WEARTH                                
048973,000304: 26,3667           45006                           PUSH     CALL                                  
048974,000305: 26,3670           51706                                    NEWANGLE                              
048975,000306: 26,3671           41401                           SETPD    PUSH                                  #  18-19D=504AZ
048976,000307: 26,3672           00023                                    18D                                   #                         COS(AZ)   SIN(AZ)     0
048977,000308: 26,3673           65346                           COS      PDDL                                  #  20-37D=  MMATRIX=     -SIN(AZ)   COS(AZ)     0    B-1
048978,000309: 26,3674           00023                                    504AZ                                 #                            0         0        1
048979,000310: 26,3675           65356                           SIN      PDDL                                  
048980,000311: 26,3676           06424                                    HI6ZEROS                              
048981,000312: 26,3677           73525                           PDDL     SIN                                   
048982,000313: 26,3700           00023                                    504AZ                                 
048983,000314: 26,3701           65276                           DCOMP    PDDL                                  
048984,000315: 26,3702           00023                                    504AZ                                 
048985,000316: 26,3703           63346                           COS      PDVL                                  
048986,000317: 26,3704           06424                                    HI6ZEROS                              
048987,000318: 26,3705           41525                           PDDL     PUSH                                  
048988,000319: 26,3706           06422                                    HIDPHALF                              
048989,000320: 26,3707           77650                           GOTO                                           
048990,000321: 26,3710           00051                                    EARTHMXX                              
048991,000322: 

Page 1142

048993,000324:                                                                                                  #  ..... EARTHL SUBROUTINE .....
048994,000325:                                                                                                  #  SUBROUTINE TO COMPUTE L VECTOR FOR EARTH
048995,000326: 
048996,000327:                                                                                                  #  CALLING SEQUENCE
048997,000328:                                                                                                  #        L       CALL
048998,000329:                                                                                                  #        L+1             EARTHL
048999,000330: 
049000,000331:                                                                                                  #  INPUT
049001,000332:                                                                                                  #        AXO,AYO SET AT LAUNCH TIME WITH AYO IMMEDIATELY FOLLOWING AXO IN CORE
049002,000333: 
049003,000334:                                                                                                  #  OUTPUT
049004,000335:                                                                                                  #                -AX
049005,000336:                                                                                                  #        MPAC=   -AY     RADIANS B-0
049006,000337:                                                                                                  #                  0
049007,000338: 
049008,000339: 26,3711           57545        EARTHL             DLOAD    DCOMP                                 
049009,000340: 26,3712           01716                                    AXO                                   
049010,000341: 26,3713           14017                           STODL    504LPL                                
049011,000342: 26,3714           01714                                    -AYO                                  
049012,000343: 26,3715           14021                           STODL    504LPL     +2                         
049013,000344: 26,3716           06424                                    HI6ZEROS                              
049014,000345: 26,3717           24023                           STOVL    504LPL     +4                         
049015,000346: 26,3720           00017                                    504LPL                                
049016,000347: 26,3721           77616                           RVQ                                            
049017,000348: 

Page 1143

049019,000350:                                                                                                  #  CONSTANTS AND ERASABLE ASSIGNMENTS
049020,000351: 
049021,000352: 26,3722  11,2272               1B1                =        DP1/2                                 #  1  SCALED B-1
049022,000353: 26,3722  0000050               RPREXIT            =        S1                                    #  R-TO-RP AND RP-TO-R SUBR EXIT
049023,000354: 26,3722  0000051               EARTHMXX           =        S2                                    #  EARTHMX,MOONMX SUBR. EXITS
049024,000355: 26,3722                        504RPR             =        0D                                    #  6 REGS        R OR RP VECTOR
049025,000356: 26,3722                        SINNODI            =        8D                                    #  2             SIN(NODI)
049026,000357: 26,3722                        DVECTR             =        8D                                    #  6             D VECTOR MOON
049027,000358: 26,3722                        CVECTR             =        8D                                    #  6             C VECTR MOON
049028,000359: 26,3722                        504AZ              =        18D                                   #  2            AZ
049029,000360: 26,3722                        TIMSUBM            =        14D                                   #  3             TIME SUB M (MOON) T+T0 IN GETAZ
049030,000361: 26,3722                        504LPL             =        14D                                   #  6             L OR LP VECTOR
049031,000362: 26,3722                        AVECTR             =        20D                                   #  6             A VECTOR (MOON)
049032,000363: 26,3722                        BVECTR             =        26D                                   #  6             B VECTOR (MOON)
049033,000364: 26,3722                        MMATRIX            =        20D                                   #  18            M MATRIX
049034,000365: 26,3722                        COB                =        32D                                   #  2             COS(B) B-1
049035,000366: 26,3722                        SOB                =        34D                                   #  2             SIN(B) B-1
049036,000367: 26,3722                        504F               =        6D                                    #  2             F(MOON)
049037,000368: 

End of include-file PLANETARY_INERTIAL_ORIENTATION.agc.  Parent file is MAIN.agc