ephemeris time
"Ephemeris time" was developed to create a consistent time scale based on celestial motions, replacing the less stable mean solar time.
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Definition
C2Astronomy
(technical, historical)A former time scale based on the orbital motions of celestial bodies, providing a uniform measure of time.
Example
- Ephemeris time was used to calculate the positions of planets before more advanced time scales were introduced.
C2Astronomy
(technical)A modern time scale based on relativistic coordinates, used for precise astronomical calculations.
Example
- Modern astronomers use a relativistic-coordinate time scale derived from ephemeris time for accurate observations.
Similar
Terms that have similar or relatively close meanings to "ephemeris time":