ref: 5622b0bbd878dbc34045cc6fd37cffa64461eabe
dir: /sys/src/cmd/astro/jup.c/
#include "astro.h"
void
jup(void)
{
double pturbl, pturbb, pturbr;
double lograd;
double dele, enom, vnom, nd, sl;
ecc = .0483376 + 163.e-6*capt;
incl = 1.308660 - .0055*capt;
node = 99.43785 + 1.011*capt;
argp = 12.71165 + 1.611*capt;
mrad = 5.202803;
anom = 225.22165 + .0830912*eday - .0484*capt;
motion = 299.1284/3600.;
anom = anom;
incl *= radian;
node *= radian;
argp *= radian;
anom = fmod(anom,360.)*radian;
enom = anom + ecc*sin(anom);
do {
dele = (anom - enom + ecc * sin(enom)) /
(1. - ecc*cos(enom));
enom += dele;
} while(fabs(dele) > converge);
vnom = 2.*atan2(sqrt((1.+ecc)/(1.-ecc))*sin(enom/2.),
cos(enom/2.));
rad = mrad*(1. - ecc*cos(enom));
lambda = vnom + argp;
pturbl = 0.;
lambda += pturbl*radsec;
pturbb = 0.;
pturbr = 0.;
/*
* reduce to the ecliptic
*/
nd = lambda - node;
lambda = node + atan2(sin(nd)*cos(incl),cos(nd));
sl = sin(incl)*sin(nd) + pturbb*radsec;
beta = atan2(sl, pyth(sl));
lograd = pturbr*2.30258509;
rad *= 1. + lograd;
lambda += 555.*radsec;
beta -= 51.*radsec;
motion *= radian*mrad*mrad/(rad*rad);
semi = 98.47;
mag = -8.93;
helio();
geo();
}