Etymology
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ephemeris (n.)

table showing predicted positions of heavenly bodies, 1550s, Modern Latin, from Greek ephemeris "diary, journal, calendar," from ephemeros "daily" (see ephemera). The classical plural is ephemerides.

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Definitions of ephemeris

ephemeris (n.)
an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year;
today computers calculate the ephemerides
From wordnet.princeton.edu