Function moon_rise_lct_l6680 

pub fn moon_rise_lct_l6680(
    x: f64,
    ds: i32,
    zc: i32,
    gdy: f64,
    gmn: u32,
    gyr: u32,
    g1: f64,
    ut: f64,
) -> (f64, f64, f64, u32, u32, f64, u32, u32)

Helper function for moon_rise_lct.