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Loading contentThe idealised time on the Earth's surface used as the time axis for astronomical events and geocentric ephemerides. It runs at the same rate as International Atomic Time but is offset ahead of it by a fixed 32.184 seconds, for continuity with the older ephemeris time.
Facts on this topic will be cited from these primary and reference sources.
Precise time, almanac data, Sun/Moon rise-set, and phases.