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[ih-fem-er-is] /ɪˈfɛm ər ɪs/
noun, plural ephemerides
[ef-uh-mer-i-deez] /ˌɛf əˈmɛr ɪˌdiz/ (Show IPA)
a table showing the positions of a heavenly body on a number of dates in a regular sequence.
an astronomical almanac containing such tables.
Archaic. an almanac or calendar.
Origin of ephemeris
1545-55; < Latin ephēmeris day book, diary < Greek ephēmerís diary, account book, derivative of ephḗmeros; see ephemeral Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ephemeris


noun (pl) ephemerides (ˌɛfɪˈmɛrɪˌdiːz)
a table giving the future positions of a planet, comet, or satellite
an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
(obsolete) a diary or almanac
Word Origin
C16: from Latin, from Greek: diary, journal; see ephemeral
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ephemeris

table showing predicted positions of heavenly bodies, 1550s, Modern Latin, from Greek ephemeris "diary, calendar," from ephemeros "daily" (see ephemera). The classical plural is ephemerides.

Online Etymology Dictionary, © 2010 Douglas Harper
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ephemeris in Science
Plural ephemerides (ěf'ə-měr'ə-dēz')
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 American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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