Function greenwich_sidereal_time_to_universal_time 

pub fn greenwich_sidereal_time_to_universal_time(
    gst_hours: f64,
    gst_minutes: f64,
    gst_seconds: f64,
    gw_day: f64,
    gw_month: u32,
    gw_year: u32,
) -> (u32, u32, f64, String)

Convert Greenwich Sidereal Time to Universal Time.

Returns

UT hours, UT minutes, UT seconds, Warning Flag