American Ephemeris and Nautical Almanac

e·phem·er·is (

-f

n. pl. eph·e·mer·i·des (

-m

-d

)

A table giving the coordinates of a celestial body at a number of specific times during a given period.

[Late Latin ephmeris, from Greek, diary, from ephmeros, daily; see ephemeral.]

ephemeris [ɪˈfɛmərɪs]

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

[from Latin, from Greek: diary, journal; see ephemeral]

ephemeris (

-f

Plural ephemerides (

-m

-d

)

A table giving the coordinates of a celestial body at specific times during a given period. Ephemerides can be used by navigators to determine their longitude while at sea and by astronomers in following objects such as comets. The use of computers has allowed modern ephemerides to determine celestial positions with far greater accuracy than in earlier publications.

ephemeris

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

ThesaurusLegend: Synonyms Related Words Antonyms

Noun

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

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