mirror of
https://github.com/9fans/plan9port.git
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95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
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#include "astro.h"
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void
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sun(void)
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{
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double mven, merth, mmars, mjup, msat;
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double dmoon, mmoon, gmoon;
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double pturbb, pturbl, pturbr, lograd;
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ecc = .01675104 - 4.180e-5 * capt - 1.26e-7*capt2;
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incl = 0;
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node = 0;
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argp = 281.220833 + .0000470684*eday + .000453*capt2
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+ .000003*capt3;
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mrad = 1;
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anom = 358.475845 + .9856002670*eday - .000150*capt2
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- .000003*capt3;
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motion = .9856473354;
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dmoon = 350.737681+12.1907491914*eday-.001436*capt2;
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gmoon = 11.250889 + 13.2293504490*eday - .003212*capt2;
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mmoon = 296.104608 + 13.0649924465*eday + 9.192e-3*capt2;
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mven = 212.448 + 1.602121635*eday;
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merth = 358.476 + 0.985600267*eday;
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mmars = 319.590 + .524024095*eday;
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mjup = 225.269 + .083082362*eday;
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msat = 175.593 + .033450794*eday;
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dmoon = fmod(dmoon, 360.)*radian;
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gmoon = fmod(gmoon, 360.)*radian;
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mmoon = fmod(mmoon, 360.)*radian;
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mven *= radian;
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merth *= radian;
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mmars *= radian;
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mjup *= radian;
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msat *= radian;
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icosadd(sunfp, suncp);
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anom += cosadd(4, mmars, merth, mven, mjup)/3600.;
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anom += sinadd(5, mmars, merth, mven, mjup, .07884*capt)/3600.;
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incl *= radian;
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node *= radian;
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argp *= radian;
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anom = fmod(anom, 360.)*radian;
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/*
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* computation of elliptic orbit
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*/
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lambda = anom + argp;
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pturbl = (6910.057 - 17.240*capt - 0.052*capt2)*sin(anom)
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+ (72.338 - 0.361*capt) * sin(2.*anom)
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+ (1.054 - 0.001*capt) * sin(3.*anom)
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+ 0.018 * sin(4.*anom);
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lambda += pturbl*radsec;
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beta = 0.;
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lograd = (30.57e-6 - 0.15e-6*capt)
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- (7274.12e-6 - 18.14e-6*capt - 0.05e-6*capt2)*cos(anom)
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- (91.38e-6 - 0.46e-6*capt) * cos(2.*anom)
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- (1.45e-6 - 0.01e-6*capt) * cos(3.*anom)
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- 0.02e-6 * cos(4.*anom);
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pturbl = cosadd(5, mmars, merth, mven, mjup, msat);
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pturbl += sinadd(3, dmoon, mmoon, merth) + .9;
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pturbl *= radsec;
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pturbb = cosadd(3, merth, mven, mjup);
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pturbb += sinadd(3, gmoon, mmoon, dmoon);
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pturbb *= radsec;
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pturbr = cosadd(5, mmars, merth, mven, mjup, msat);
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pturbr += cosadd(3, dmoon, mmoon, merth);
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lambda += pturbl;
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if(lambda > pipi)
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lambda -= pipi;
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beta += pturbb;
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lograd = (lograd+pturbr) * 2.30258509;
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rad = 1 + lograd * (1 + lograd * (.5 + lograd/6));
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motion *= radian*mrad*mrad/(rad*rad);
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semi = 961.182;
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if(flags['o'])
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semi = 959.63;
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mag = -26.5;
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}
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