In metrology, ephemeris time (ET) is time in association with any ephemeris (itinerary of the trajectory of an astronomical object). In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, and superseded during the 1970s.
In metrology, ephemeris time (ET) is time in association with any ephemeris (itinerary of the trajectory of an astronomical object). In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the IAU, and superseded during the 1970s.
Source: Wikipedia "Ephemeris time" · CC BY-SA 4.0
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