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ephemeris

Pronunciation: /ɪˈfɛm(ə)rɪs, -ˈfiːm-/

Definition of ephemeris

noun (plural ephemerides /ˌɛfɪˈmɛrɪdiːz/)

Astronomy & Astrology

a table or data file giving the calculated positions of a celestial object at regular intervals throughout a period: you can compute an ephemeris for any comet that is discovered and plot an accurate finder chart