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英日字典: ephemeris_time

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

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