Function local_sidereal_time_to_greenwich_sidereal_time 

pub fn local_sidereal_time_to_greenwich_sidereal_time(
    lst_hours: f64,
    lst_minutes: f64,
    lst_seconds: f64,
    geographical_longitude: f64,
) -> (u32, u32, f64)

Convert Local Sidereal Time to Greenwich Sidereal Time.

Returns

GST hours, GST minutes, GST seconds