CalcGreenwichTime calculates Greenwich Time.
- GAST (= Greenwich apparent sidereal time)
- GMST (= Greenwich mean sidereal time)
- EE (= Equation of Equinoxes)
./calc_greenwich_time.rb [YYYYMMDD[HHMMSS]]
If you don't specify a argument, calc_greenwich_time.rb
regards system's date-time as TT(Terrestrial Time).
And, calc_greenwich_time.rb
also outputs progresses.