CalcGreenwichTime

Introduction

CalcGreenwichTime calculates Greenwich Time.

• GAST (= Greenwich apparent sidereal time)
• GMST (= Greenwich mean sidereal time)
• EE (= Equation of Equinoxes)

Usage

./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.