Function twilight_am_lct_l3710 

pub fn twilight_am_lct_l3710(
    gd: f64,
    gm: u32,
    gy: u32,
    sr: f64,
    di: f64,
    gp: f64,
) -> (f64, f64, f64, f64, String)

Helper function for twilight_am_lct().