Type Alias TimeSystem

TimeSystem: "UT" | "UTC" | "TT" | "local"

Time system classification

Different time scales used in astronomy and daily life:

UT: Universal Time (based on Earth's rotation)
UTC: Coordinated Universal Time (civil time standard with leap seconds)
TT: Terrestrial Time (uniform time scale for ephemeris, TT = UTC + ΔT)
local: Local civil time (includes timezone offset)