ephemeris

ephemeris

[ih-fem-er-is]
noun, plural ephemerides [ef-uh-mer-i-deez] .
1.
a table showing the positions of a heavenly body on a number of dates in a regular sequence.
2.
an astronomical almanac containing such tables.
3.
Archaic. an almanac or calendar.

Origin:
1545–55; < Latin ephēmeris day book, diary < Greek ephēmerís diary, account book, derivative of ephḗmeros; see ephemeral

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World English Dictionary
ephemeris (ɪˈfɛmərɪs)
 
n , pl ephemerides
1.  a table giving the future positions of a planet, comet, or satellite
2.  an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
3.  obsolete a diary or almanac
 
[C16: from Latin, from Greek: diary, journal; see ephemeral]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

ephemeris
table showing predicted positions of heavenly bodies, 1550s, Mod.L., from Gk. ephemeris diary, calendar, from ephemeros daily. (see ephemera). The classical plural is ephemerides.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ephemeris   (ĭ-fěm'ər-ĭs)  Pronunciation Key 
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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