ephemeris time   (TTS Sound)

The ephemeris_time has 1 Senses.

• tdt, tt, terrestrial time, terrestrial dynamical time, ephemeris time
• (astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions
• 地球の公転運動により定義される時間の単位