A table giving the coordinates of a celestial body at a number of specific times during a given period.
A table giving the computed positions of a celestial body for every day of a given period.
An astronomical almanac containing such tables.
(obs.) A calendar or diary.
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.
The astronomical position of objects in the sky.
Software that calculates the apparent position of celestial bodies.
Origin of ephemeris
- Late Latin ephēmeris from Greek diary from ephēmeros daily ephemeral
From American Heritage Dictionary of the English Language, 5th Edition
- Modern Latin, from Ancient Greek ἐφημερίς (ephēmeris, “diary, calendar”), from ἐφήμερος (ephēmeros, “daily”).