ephemeris second

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0.02 sec.

ephemeris second [ə′fem·ə·rəs ′sek·ənd]

(astronomy)

The fundamental unit of time of the International System of Units from 1960 until 1968, equal to 1/31556925.9747 of the tropical year defined by the mean motion of the sun in longitude at the epoch 1900 January 0 day 12 hours.

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ephemeris day
Julian ephemeris century

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