Function astro::planet::saturn::moon::apprnt_rect_coords [−] [src]

pub fn apprnt_rect_coords(JD: f64, moon: &Moon) -> (f64, f64, f64)

Computes the apparent rectangular coordinates for a moon of Saturn

Returns

(X, Y, Z)

The rectangular coordinates returned give the apparent position of a moon with respect to Saturn as seen from Earth. The X and Y coordinates are measured from the center of the disk of Saturn, in units of Saturn's equatorial radius.

X is measured positively to the west of Saturn, and negatively to the east. The x-axis coincides with Saturn's equator.

Y is measured positively to the north of Saturn, and negatively to the south. The y-axis coincides with Saturn's axis of rotation.

Z only matters in sign; it is positive if the Earth-moon distance is greater than the Earth-Saturn distance, and is negative if the Earth-moon distance is lesser than the Earth-Saturn distance.

Arguments