Notations on the program listing read, in part:
GAP: ASSEMBLE REVISION 56 OF AGC PROGRAM ZERLINA BY ZOROASTER 9:12 OCT. 21,1970Note that the date is the date of the printout, not the date of the program revision.
Source Code
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These source-code files were transcribed from a printout in Don Eyles's personal
collection, scanned by archive.org, and financially sponsored by Linden Sims.
A team of volunteers performed the transcription and proof-reading. The scanned
page images are available at
the Virtual AGC Project website, as well as higher-quality (but much larger)
images at
the Virtual AGC Project's collection in the Internet Archive. Report any problems by creating
"issues" at
the Virtual AGC Project's GitHub Repository. Notations on the program listing read, in part: GAP: ASSEMBLE REVISION 56 OF AGC PROGRAM ZERLINA BY ZOROASTER 9:12 OCT. 21,1970Note that the date is the date of the printout, not the date of the program revision. |
048967,000002: ## Copyright: Public domain.
048968,000003: ## Filename: LATITUDE_LONGITUDE_SUBROUTINES.agc
048969,000004: ## Purpose: A log section of Zerlina 56, the final revision of
048970,000005: ## Don Eyles's offline development program for the variable
048971,000006: ## guidance period servicer. It also includes a new P66 with LPD
048972,000007: ## (Landing Point Designator) capability, based on an idea of John
048973,000008: ## Young's. Neither of these advanced features were actually flown,
048974,000009: ## but Zerlina was also the birthplace of other big improvements to
048975,000010: ## Luminary including the terrain model and new (Luminary 1E)
048976,000011: ## analog display programs. Zerlina was branched off of Luminary 145,
048977,000012: ## and revision 56 includes all changes up to and including Luminary
048978,000013: ## 183. It is therefore quite close to the Apollo 14 program,
048979,000014: ## Luminary 178, where not modified with new features.
048980,000015: ## Reference: pp. 1124-1130
048981,000016: ## Assembler: yaYUL
048982,000017: ## Contact: Ron Burkey <info@sandroid.org>.
048983,000018: ## Website: www.ibiblio.org/apollo/index.html
048984,000019: ## Mod history: 2017-07-28 MAS Created from Luminary 210.
048985,000020: ## 2017-08-28 MAS Updated for Zerlina 56.
048986,000021:
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Page 1124 |
048988,000023: # SUBROUTINE TO CONVERT RAD VECTOR AT GIVEN TIME TO LAT,LONG AND ALT
048989,000024:
048990,000025: # CALLING SEQUENCE
048991,000026:
048992,000027: # L-1 CALL
048993,000028: # L LAT-LONG
048994,000029: # SUBROUTINES USED
048995,000030:
048996,000031: # R-TO-RP,ARCTAN,SETGAMMA,SETRE
048997,000032: # ERASABLE INIT. REQ.
048998,000033:
048999,000034: # AXO,-AYO,AZO,TEPHEM (SET AT LAUNCH TIME)
049000,000035: # ALPHAV = POSITION VECTOR METERS B-29
049001,000036: # MPAC-- TIME (CSECS B-28)
049002,000037: # ERADFLAG =1, TO COMPUTE EARTH RADIUS, =0 FOR FIXED EARTH RADIUS
049003,000038: # LUNAFLAG=0 FOR EARTH,1 FOR MOON
049004,000039: # OUTPUT
049005,000040:
049006,000041: # LATITUDE IN LAT (REVS. B-0)
049007,000042: # LONGITUDE IN LONG (REVS. B-0)
049008,000043: # ALTITUDE IN ALT METERS B-29
049009,000044: 30,3761 BANK 30
049010,000045: 13,2000 SETLOC LATLONG
049011,000046: 13,2000 BANK
049012,000047:
049013,000048: 13,2347 COUNT* $$/LT-LG
049014,000049: 13,2347 E4,1431 EBANK= ALPHAV
049015,000050: 13,2347 40220 LAT-LONG STQ SETPD
049016,000051: 13,2350 03674 INCORPEX
049017,000052: 13,2351 00001 0D
049018,000053: 13,2352 24007 STOVL 6D # SAVE TIME IN 6-7D FOR R-TO-RP
049019,000054: 13,2353 02032 ALPHAV
049020,000055: 13,2354 51406 PUSH ABVAL # 0-5D= R FOR R-TO-RP
049021,000056: 13,2355 16070 STODL ALPHAM # ABS. VALUE OF R FOR ALT FORMULA BELOW
049022,000057: 13,2356 24007 ZEROVEC # SET MPAC=0 FOR EARTH,NON-ZERO FOR MOON
049023,000058: 13,2357 71414 BOFF COS # USE COS(0) TO GET NON-ZERO IN MPAC
049024,000059: 13,2360 01743 LUNAFLAG # 0=EARTH,1=MOON
049025,000060: 13,2361 26362 CALLRTRP
049026,000061: 13,2362 77624 CALLRTRP CALL
049027,000062: 13,2363 51644 R-TO-RP # RP VECTOR CONVERTED FROM R B-29
049028,000063: 13,2364 77656 UNIT # UNIT RP B-1
049029,000064: 13,2365 36032 STCALL ALPHAV # U2= 1/2 SINL FOR SETRE SUBR BELOW
049030,000065: 13,2366 26546 SETGAMMA # SET GAMMA=B2/A2 FOR EARTH,=1 FOR MOON
049031,000066: 13,2367 77624 CALL # SCALED B-1
049032,000067: 13,2370 26556 SETRE # CALC RE METERS B-29
049033,000068: 13,2371 63545 DLOAD DSQ
049034,000069: 13,2372 02032 ALPHAV
049035,000070: 13,2373 63525 PDDL DSQ
049036,000071: 13,2374 02034 ALPHAV +2
049037,000072: 13,2375 75415 DAD SQRT
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Page 1125 |
049039,000074: 13,2376 76405 DMP SL1R
049040,000075: 13,2377 00011 GAMRP
049041,000076: 13,2400 14021 STODL COSTH # COS(LAT) B-1
049042,000077: 13,2401 02036 ALPHAV +4
049043,000078: 13,2402 34023 STCALL SINTH # SIN(LAT) B-1
049044,000079: 13,2403 26506 ARCTAN
049045,000080: 13,2404 15120 STODL LAT # LAT B0
049046,000081: 13,2405 02032 ALPHAV
049047,000082: 13,2406 14021 STODL COSTH # COS(LONG) B-1
049048,000083: 13,2407 02034 ALPHAV +2
049049,000084: 13,2410 34023 STCALL SINTH # SIN(LONG) B-1
049050,000085: 13,2411 26506 ARCTAN
049051,000086: 13,2412 15122 STODL LONG # LONG. REVS B-0 IN RANGE -1/2 TO 1/2
049052,000087: 13,2413 02070 ALPHAM
049053,000088: 13,2414 77625 DSU # ALT= R-RE METERS B-29
049054,000089: 13,2415 03673 ERADM
049055,000090: 13,2416 35124 STCALL ALT # EXIT WITH ALT METERS B-29
049056,000091: 13,2417 03674 INCORPEX
049057,000092:
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Page 1126 |
049059,000094: # SUBROUTINE TO CONVERT LAT,LONG,ALT AT GIVEN TIME TO RADIUS VECTOR
049060,000095: # CALLING SEQUENCE
049061,000096:
049062,000097: # L-1 CALL
049063,000098: # L LALOTORV
049064,000099: # SUBROUTINES USED
049065,000100:
049066,000101: # SETGAMMA,SETRE,RP-TO-R
049067,000102: # ERASABLE INIT. REQ.
049068,000103:
049069,000104: # AXO,AYO,AZO,TEPHEM SET AT LAUNCH TIME
049070,000105: # LAT-- LATITUDE (REVS B0)
049071,000106: # LONG-- LONGITUDE (REVS B0)
049072,000107: # ALT--ALTITUDE (METERS) B-29
049073,000108: # MPAC-- TIME (CSECS B-28)
049074,000109: # ERADFLAG =1 TO COMPUTE EARTH RADIUS, =0 FOR FIXED EARTH RADIUS
049075,000110: # LUNAFLAG=0 FOR EARTH,1 FOR MOON
049076,000111: # OUTPUT
049077,000112:
049078,000113: # R-VECTOR IN ALPHAV (METERS B-29)
049079,000114: 13,2420 40220 LALOTORV STQ SETPD # LAT,LONG,ALT TO R VECTOR
049080,000115: 13,2421 03674 INCORPEX
049081,000116: 13,2422 00001 0D
049082,000117: 13,2423 34007 STCALL 6D # 6-7D= TIME FOR RP-TO-R
049083,000118: 13,2424 26546 SETGAMMA # GAMMA=B2/A2 FOR EARTH,1 FOR MOON B-1
049084,000119: 13,2425 73545 DLOAD SIN # COS(LONG)COS(LAT) IN MPAC
049085,000120: 13,2426 01120 LAT # UNIT RP= SIN(LONG)COS(LAT) 2-3D
049086,000121: 13,2427 65275 DMPR PDDL # PD 2 GAMMA*SIN(LAT) 0-1D
049087,000122: 13,2430 00011 GAMRP
049088,000123: 13,2431 01120 LAT # 0-1D= GAMMA*SIN(LAT) B-2
049089,000124: 13,2432 65346 COS PDDL # PD4 2-3D=COS(LAT) B-1 TEMPORARILY
049090,000125: 13,2433 01122 LONG
049091,000126: 13,2434 57356 SIN DMPR # PD 2
049092,000127: 13,2435 71525 PDDL COS # PD 4 2-3D=SIN(LONG)COS(LAT) B-2
049093,000128: 13,2436 01120 LAT
049094,000129: 13,2437 71525 PDDL COS # PD 6 4-5D=COS(LAT) B-1 TEMPORARILY
049095,000130: 13,2440 01122 LONG
049096,000131: 13,2441 55475 DMPR VDEF # PD 4 MPAC= COS(LONG)COS(LAT) B-2
049097,000132: 13,2442 41456 UNIT PUSH # 0-5D= UNIT RP FOR RP-TO-R SUBR.
049098,000133: 13,2443 36032 STCALL ALPHAV # ALPHAV +4= SINL FOR SETRE SUBR.
049099,000134: 13,2444 26556 SETRE # RE METERS B-29
049100,000135: 13,2445 43145 DLOAD BOFF # SET MPAC=0 FOR EARTH,NON-ZERO FOR MOON
049101,000136: 13,2446 24007 ZEROVEC
049102,000137: 13,2447 01743 LUNAFLAG
049103,000138: 13,2450 26452 CALLRPRT
049104,000139: 13,2451 77746 COS # USE COS(0) TO GET NON-ZERO IN MPAC
049105,000140: 13,2452 77624 CALLRPRT CALL
049106,000141: 13,2453 55720 RP-TO-R # EXIT WITH UNIT R VECTOR IN MPAC
049107,000142: 13,2454 16032 STODL ALPHAV
049108,000143: 13,2455 03673 ERADM
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Page 1127 |
049110,000145: 13,2456 74215 DAD VXSC # (RE + ALT)(UNIT R) METERS B-30
049111,000146: 13,2457 01124 ALT
049112,000147: 13,2460 02032 ALPHAV
049113,000148: 13,2461 77772 VSL1 # R METERS B-29
049114,000149: 13,2462 36032 STCALL ALPHAV # EXIT WITH R IN METERS B-29
049115,000150: 13,2463 03674 INCORPEX
049116,000151: # SUBROUTINE TO COMPUTE EARTH RADIUS
049117,000152:
049118,000153: # INPUT
049119,000154:
049120,000155: # 1/2 SIN LAT IN ALPHAV +4
049121,000156:
049122,000157: # OUTPUT
049123,000158:
049124,000159: # EARTH RADIUS IN ERADM AND MPAC (METERS B-29)
049125,000160:
049126,000161: 13,2464 63545 GETERAD DLOAD DSQ
049127,000162: 13,2465 02036 ALPHAV +4 # SIN**2(L)
049128,000163: 13,2466 44352 SL1 BDSU
049129,000164: 13,2467 24005 DP1/2 # COS**2(L)
049130,000165: 13,2470 44275 DMPR BDSU
049131,000166: 13,2471 26505 EE
049132,000167: 13,2472 24005 DP1/2
049133,000168: 13,2473 75465 BDDV SQRT
049134,000169: 13,2474 26501 B2XSC
049135,000170: 13,2475 77622 SR4R
049136,000171: 13,2476 03673 STORE ERADM
049137,000172: 13,2477 77616 RVQ
049138,000173:
049139,000174: # THE FOLLOWING CONSTANTS WERE COMPUTED WITH A=6378166,B=6356784 METERS
049140,000175: # B2XSC= B**2 SCALED B-51
049141,000176: # B2/A2= B**2/A**2 SCALED B-1
049142,000177: # EE=(1-B**2/A**2) SCALED B-0
049143,000178: 13,2500 00446 00305 B2XSC 2DEC .0179450689 # B**2 SCALED B-51
049144,000179:
049145,000180: 13,2502 12,2004 DP1/2 = XUNIT
049146,000181: 13,2502 17711 05254 B2/A2 2DEC .9933064884 B-1 # GAMMA= B**2/A**2 B-1
049147,000182:
049148,000183: 13,2504 00155 25250 EE 2DEC 6.6935116 E-3 # (1-B**2/A**2) B-0
049149,000184:
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Page 1128 |
049151,000186: # ARCTAN SUBROUTINE
049152,000187:
049153,000188:
049154,000189: # CALLING SEQUENCE
049155,000190:
049156,000191: # SIN THETA IN SINTH B-1
049157,000192: # COS THETA IN COSTH B-1
049158,000193: # CALL ARCTAN
049159,000194:
049160,000195: # OUTPUT
049161,000196: # ARCTAN THETA IN MPAC AND THETA B-0 IN RANGE -1/2 TO +1/2
049162,000197:
049163,000198:
049164,000199: 13,2506 77600 ARCTAN BOV
049165,000200: 13,2507 26510 CLROVFLW
049166,000201: 13,2510 63545 CLROVFLW DLOAD DSQ
049167,000202: 13,2511 00023 SINTH
049168,000203: 13,2512 63525 PDDL DSQ
049169,000204: 13,2513 00021 COSTH
049170,000205: 13,2514 77615 DAD
049171,000206: 13,2515 75454 BZE SQRT
049172,000207: 13,2516 26534 ARCTANXX # ATAN=0/0 SET THETA=0
049173,000208: 13,2517 40065 BDDV BOV
049174,000209: 13,2520 00023 SINTH
049175,000210: 13,2521 26541 ATAN=90
049176,000211: 13,2522 67542 SR1 ASIN
049177,000212: 13,2523 00025 STORE THETA
049178,000213: 13,2524 50125 PDDL BMN
049179,000214: 13,2525 00021 COSTH
049180,000215: 13,2526 26530 NEGCOS
049181,000216: 13,2527 43545 DLOAD RVQ
049182,000217: 13,2530 57545 NEGCOS DLOAD DCOMP
049183,000218: 13,2531 43244 BPL DAD
049184,000219: 13,2532 26536 NEGOUT
049185,000220: 13,2533 24005 DP1/2
049186,000221: 13,2534 00025 ARCTANXX STORE THETA
049187,000222: 13,2535 77616 RVQ
049188,000223:
049189,000224: 13,2536 52025 NEGOUT DSU GOTO
049190,000225: 13,2537 24005 DP1/2
049191,000226: 13,2540 26534 ARCTANXX
049192,000227: 13,2541 75345 ATAN=90 DLOAD SIGN
049193,000228: 13,2542 11011 LODP1/4
049194,000229: 13,2543 00023 SINTH
049195,000230: 13,2544 00025 STORE THETA
049196,000231: 13,2545 77616 RVQ
049197,000232:
049198,000233: 13,2546 12,2006 2DZERO = DPZERO
049199,000234:
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Page 1129 |
049201,000236: # ..... SETGAMMA SUBROUTINE .....
049202,000237: # SUBROUTINE TO SET GAMMA FOR THE LAT-LONG AND LALOTORV SUBROUTINES
049203,000238:
049204,000239: # GAMMA = B**2/A**2 FOR EARTH (B-1)
049205,000240: # GAMMA = 1 FOR MOON (B-1)
049206,000241:
049207,000242: # CALLING SEQUENCE
049208,000243: # L CALL
049209,000244: # L+1 SETGAMMA
049210,000245:
049211,000246: # INPUT
049212,000247: # LUNAFLAG=0 FOR EARTH,=1 FOR MOON
049213,000248:
049214,000249: # OUTPUT
049215,000250: # GAMMA IN GAMRP (B-1)
049216,000251:
049217,000252: 13,2546 43145 SETGAMMA DLOAD BOFF # BRANCH FOR EARTH
049218,000253: 13,2547 26503 B2/A2 # EARTH GAMMA
049219,000254: 13,2550 01743 LUNAFLAG
049220,000255: 13,2551 26554 SETGMEX
049221,000256: 13,2552 77735 SLOAD
049222,000257: 13,2553 24005 1B1 # MOON GAMMA
049223,000258: 13,2554 00011 SETGMEX STORE GAMRP
049224,000259: 13,2555 77616 RVQ
049225,000260: 13,2556 GAMRP = 8D
049226,000261:
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Page 1130 |
049228,000263: # .....SETRE SUBROUTINE .....
049229,000264: # SUBROUTINE TO SET RE (EARTH OR MOON RADIUS)
049230,000265:
049231,000266: # RE= RM FOR MOON
049232,000267: # RE= RREF FOR FIXED EARTH RADIUS OR COMPUTED RF FOR FISCHER ELLIPSOID
049233,000268:
049234,000269: # CALLING SEQUENCE
049235,000270: # L CALL
049236,000271: # L+1 SETRE
049237,000272:
049238,000273: # SUBROUTINES USED
049239,000274: # GETERAD
049240,000275:
049241,000276: # INPUT
049242,000277: # ERADFLAG=0 FOR FIXED RE, 1 FOR COMPUTED RE
049243,000278: # ALPHAV +4= 1/2 SINL IF GETERAD IS CALLED
049244,000279: # LUNAFLAG=0 FOR EARTH,=1 FOR MOON
049245,000280:
049246,000281: # OUTPUT
049247,000282: # ERADM= 504RM FOR MOON (METERS B-29)
049248,000283: # ERADM= ERAD OR COMPUTED RF FOR EARTH (METERS B-29)
049249,000284:
049250,000285: 13,2556 71220 SETRE STQ DLOAD
049251,000286: 13,2557 00051 SETREX
049252,000287: 13,2560 10003 504RM
049253,000288: 13,2561 71214 BON DLOAD # BRANCH FOR MOON
049254,000289: 13,2562 01703 LUNAFLAG
049255,000290: 13,2563 26573 TSTRLSRM
049256,000291: 13,2564 10001 ERAD
049257,000292: 13,2565 45014 BOFF CALL # ERADFLAG=0 FOR FIXED RE,1 FOR COMPUTED
049258,000293: 13,2566 00742 ERADFLAG
049259,000294: 13,2567 26571 SETRXX
049260,000295: 13,2570 26464 GETERAD
049261,000296: 13,2571 37673 SETRXX STCALL ERADM # EXIT WITH RE OR RM METERS B-29
049262,000297: 13,2572 00051 SETREX
049263,000298: 13,2573 77214 TSTRLSRM BON VLOAD # ERADFLAG=0,SET R0=RLS
049264,000299: 13,2574 00702 ERADFLAG # =1 R0=RM
049265,000300: 13,2575 26571 SETRXX
049266,000301: 13,2576 02021 RLS
049267,000302: 13,2577 64446 ABVAL SR2R # SCALE FROM B-27 TO B-29
049268,000303: 13,2600 77650 GOTO
049269,000304: 13,2601 26571 SETRXX
049270,000305: 13,2602 0000051 SETREX = S2
End of include-file LATITUDE_LONGITUDE_SUBROUTINES.agc. Parent file is MAIN.agc