Function apsis::comet_apparent_magnitude

pub fn comet_apparent_magnitude(
    absolute_magnitude: f64, 
    coefficient: f64, 
    dist_to_sun: f64, 
    dist_to_earth: f64
) -> f64

This computes the apparent magnitude of a comet

The distances to the sun and to earth are in astronomical units. absolute_magnitude and coefficient need to be deduced from observations.