Modern ephemerides are often provided in electronic form. The calculation of these tables was one of the first applications of mechanical computers. Historically, positions were given as printed tables of values, given at regular intervals of date and time. ephemerides / ˌ ɛ f ə ˈ m ɛ r ə d iː z/ from Latin ephemeris 'diary', and Greek ἐφημερίς (ephemeris) 'diary, journal') is a book with tables that gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and possibly velocity) over time. In astronomy and celestial navigation, an ephemeris ( / ɪ ˈ f ɛ m ə r ə s/ pl. ![]() ![]() For the 18th-century Greek newspaper, see Efimeris.
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