The Collaborative International Dictionary
Ephemeris \E*phem"e*ris\, n.; pl. Ephemerides. [L., a diary, Gr. ?, also, a calendar, fr. ?. See Ephemera.]
A diary; a journal.
--Johnson.-
(Anat.)
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.''
Any tabular statement of the assigned places of a heavenly body, as a planet or comet, on several successive days.
(Literature) A collective name for reviews, magazines, and all kinds of periodical literature.
--Brande & C.
Wiktionary
n. 1 (plural of ephemeris English) 2 (context plural taken as singular English) An ephemeris.
WordNet
See ephemeris
n. an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year; "today computers calculate the ephemerides"
[also: ephemerides (pl)]
Usage examples of "ephemerides".
Just clothes and a few mementos, including a book of ephemerides Leie had given her as a birthday present.
Liath set tablet and stylus down on the table and unlocked the book cupboard where the ephemerides lay stored among other such treasures, the repository of centuries of knowledge hoarded and saved from the ravages of time and ignorant men.
But the moment now had come, and it would be on that very night: the sky and the ephemerides said that now was the right occasion.
Astronomers have long known when lunar eclipses would occur, and the ephemerides were authoritative.
I do not secretly implore and wish for Plagues, rejoyce at Famines, revolve Ephemerides and Almanacks in expectation of malignant Aspects, fatal Conjunctions, and Eclipses.