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n. pl. eph·e·mer·i·des (ĕf′ə-mĕr′ə-dēz′)
A table giving the coordinates of a celestial body at a number of specific times during a given period.

[Late Latin ephēmeris, from Greek, diary, from ephēmeros, daily; see ephemeral.]


n, pl ephemerides (ˌɛfɪˈmɛrɪˌdiːz)
1. (Astronomy) a table giving the future positions of a planet, comet, or satellite
2. (Astronomy) an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
3. (Library Science & Bibliography) obsolete a diary or almanac
[C16: from Latin, from Greek: diary, journal; see ephemeral]


(ɪˈfɛm ər ɪs)

n., pl. e•phe•mer•i•des (ˌɛf əˈmɛr ɪˌdiz)
1. a table showing the positions of a heavenly body on a number of dates in a regular sequence.
2. an astronomical almanac containing such tables.
3. Archaic. an almanac or calendar.
[1545–55; < Latin ephēmeris day book, diary < Greek ephēmerís diary, account book]


an astronomical almanac giving, as an aid to the astronomer and navigator, the locations of celestial bodies for each day of the year.
See also: Almanacs


A table that shows the coordinates of a celestial body at various specific times.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ephemeris - an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year; "today computers calculate the ephemerides"
yearly, annual, yearbook - a reference book that is published regularly once every year
References in periodicals archive ?
Around 1830 eclipse maps started to appear in three of the main annual ephemerides of the 19th century: the French nautical almanac Connaissance des Temps, the British Nautical Almanac and Astronomical Ephemeris, and the American Ephemeris and Nautical Almanac. Eclipse maps are just about the only illustrations that appear within these ephemerides, each of which contain hundreds of pages of numerical tables for the motions of the Sun, Moon, and planets, along with star positions.
The Astronomical Almanac, which replaced both the venerable American Ephemeris and Nautical Almanac and the Astronomical Ephemeris in 1981, is a weighty, stern publication largely targeted for professional astronomers.
A separate volume, the Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac, published in 1961, contained the complete explanations of the ephemerides and their computation.

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