static int HorizontalCoords(
out Spherical hor,
double ecliptic_longitude,
AstroTime time,
RotationMatrix rot_ecl_hor)
{
var eclip = new Spherical(
0.0, /* being "on the ecliptic plane" means ecliptic latitude is zero. */
ecliptic_longitude,
1.0 /* any positive distance value will work fine. */
);
/* Convert ecliptic angular coordinates to ecliptic vector. */
AstroVector ecl_vec = Astronomy.VectorFromSphere(eclip, time);
/* Use the rotation matrix to convert ecliptic vector to horizontal vector. */
AstroVector hor_vec = Astronomy.RotateVector(rot_ecl_hor, ecl_vec);
/* Find horizontal angular coordinates, correcting for atmospheric refraction. */
hor = Astronomy.HorizonFromVector(hor_vec, Refraction.Normal);
return(0); /* success */
}
