Ephemeris Definition
ĭ-fĕmər-ĭs
ephemerides
noun
A table giving the computed positions of a celestial body for every day of a given period.
Webster's New World
An astronomical almanac containing such tables.
Webster's New World
A calendar or diary.
Webster's New World
Origin of Ephemeris
Modern Latin, from Ancient Greek ἐφημερίς (ephēmeris, “diary, calendar”), from ἐφήμερος (ephēmeros, “daily”).
From Wiktionary
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Late Latin ephēmeris from Greek diary from ephēmeros daily ephemeral
From American Heritage Dictionary of the English Language, 5th Edition
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