ephemeris
UK /ɪˈfɛməɹɪs/ · US /ɪˈfɛməɹəs/ noun
Forms ephemerides ephemerises
- noun (obsolete) A journal or diary.
- noun (astronomy, nautical) A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination.
- noun Computer software that calculates the apparent position of celestial bodies.
Synonyms
Etymology
From New Latin ephēmeris, from Ancient Greek ἐφημερίς (ephēmerís, “diary, calendar”), from ἐφήμερος (ephḗmeros, “daily”).
Webster’s 1913
- noun A diary; a journal. Johnson.
- noun (a) A publication giving the computed places of the heavenly bodies for each day of the year, with other numerical data, for the use of the astronomer and navigator; an astronomical almanac; as, the "American Ephemeris and Nautical Almanac." (b) Any tabular statement of the assigned places of a heavenly body, as a planet or comet, on several successive days.
Etymology [L., a diary, Gr. Ephemera.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “ephemeris”, CC BY-SA 4.0. Details