Time on a scale defined by the orbital period rather than the axial rotation of the earth.
- When ephemeris time does become relevant is when our questions are on general indications over long periods of time, or when we wish to look beyond the immediate limits imposed by the question to see what may happen over a longer period.
- Leap seconds are inserted only for human convenience, and eclipse phenomena are computed using astronomers' dynamical or ephemeris time systems.
Definition of ephemeris time in:
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