Subversion Repositories planix.SVN

#include "astro.h"

void
sun(void)
{
        double mven, merth, mmars, mjup, msat;
        double dmoon, mmoon, gmoon;
        double pturbb, pturbl, pturbr, lograd;

        ecc = .01675104 - 4.180e-5 * capt - 1.26e-7*capt2;
        incl = 0;
        node = 0;
        argp = 281.220833 + .0000470684*eday + .000453*capt2
                 + .000003*capt3;
        mrad = 1;
        anom = 358.475845 + .9856002670*eday - .000150*capt2
                 - .000003*capt3;
        motion = .9856473354;

        dmoon = 350.737681+12.1907491914*eday-.001436*capt2;
        gmoon = 11.250889 + 13.2293504490*eday - .003212*capt2;
        mmoon = 296.104608 + 13.0649924465*eday + 9.192e-3*capt2;
        mven  = 212.448 + 1.602121635*eday;
        merth = 358.476 + 0.985600267*eday;
        mmars = 319.590 + .524024095*eday;
        mjup = 225.269 + .083082362*eday;
        msat  = 175.593 + .033450794*eday;

        dmoon = fmod(dmoon, 360.)*radian;
        gmoon = fmod(gmoon, 360.)*radian;
        mmoon = fmod(mmoon, 360.)*radian;
        mven  *= radian;
        merth *= radian;
        mmars *= radian;
        mjup *= radian;
        msat  *= radian;

        icosadd(sunfp, suncp);
        anom += cosadd(4, mmars, merth, mven, mjup)/3600.;
        anom += sinadd(5, mmars, merth, mven, mjup, .07884*capt)/3600.;

        incl *= radian;
        node *= radian;
        argp *= radian;
        anom = fmod(anom, 360.)*radian;

/*
 *      computation of elliptic orbit
 */

        lambda = anom + argp;

        pturbl = (6910.057 - 17.240*capt - 0.052*capt2)*sin(anom)
                 + (72.338 - 0.361*capt) * sin(2.*anom)
                 + (1.054 - 0.001*capt) * sin(3.*anom)
                 + 0.018 * sin(4.*anom);

        lambda += pturbl*radsec;

        beta = 0.;

        lograd = (30.57e-6 - 0.15e-6*capt)
                 - (7274.12e-6 - 18.14e-6*capt - 0.05e-6*capt2)*cos(anom)
                 - (91.38e-6 - 0.46e-6*capt) * cos(2.*anom)
                 - (1.45e-6 - 0.01e-6*capt) * cos(3.*anom)
                 - 0.02e-6 * cos(4.*anom);

        pturbl = cosadd(5, mmars, merth, mven, mjup, msat);
        pturbl += sinadd(3, dmoon, mmoon, merth) + .9;
        pturbl *= radsec;

        pturbb =  cosadd(3, merth, mven, mjup);
        pturbb += sinadd(3, gmoon, mmoon, dmoon);
        pturbb *= radsec;

        pturbr =  cosadd(5, mmars, merth, mven, mjup, msat);
        pturbr += cosadd(3, dmoon, mmoon, merth);

        lambda += pturbl;
        if(lambda > pipi)
                lambda -= pipi;

        beta += pturbb;

        lograd = (lograd+pturbr) * 2.30258509;
        rad = 1 + lograd * (1 + lograd * (.5 + lograd/6));

        motion *= radian*mrad*mrad/(rad*rad);

        semi = 961.182;
        if(flags['o'])
                semi = 959.63;
        mag = -26.5;
}