ephemeris
Americannoun
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a table showing the positions of a heavenly body on a number of dates in a regular sequence.
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an astronomical almanac containing such tables.
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Archaic. an almanac or calendar.
noun
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a table giving the future positions of a planet, comet, or satellite
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an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
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obsolete a diary or almanac
Other Word Forms
Noun Inflected Forms
Etymology
Origin of ephemeris
1545–55; < Latin ephēmeris day book, diary < Greek ephēmerís diary, account book, derivative of ephḗmeros; see ephemeral
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
This is the offset to apply to Chariklo’s ephemeris to fit the observations.
From Nature ● Apr. 4, 2014
Chronometry -- N. chronometry, horometry†, horology; date, epoch; style, era. almanac, calendar, ephemeris; register, registry; chronicle, annals, journal, diary.
From Roget's Thesaurus of English Words and Phrases by Roget, Peter Mark
Commencing with the ephemeris for the year 1883, Hansen's tables are introduced with corrections to the mean longitude founded on two centuries of observation.
From Side-Lights on Astronomy and Kindred Fields of Popular Science by Newcomb, Simon
From the resulting elements of the orbit the positions of the body from day to day may be computed and tabulated in an ephemeris for the use of observers.
From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various
Those who, after all, may not care to consult the ephemeris in order to find the planets, may be able to locate them, simply from a knowledge of their situation among the constellations.
From Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries by Serviss, Garrett Putman
Of the regular annual ephemerides the earliest, so far as I am aware, is the Connaissance des Temps or French Nautical Almanac.
From Side-Lights on Astronomy and Kindred Fields of Popular Science by Newcomb, Simon
Two systems of eclipse elements are now adopted in the ephemerides and tables; the one, that of F.W.
From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various
To avoid any chance of mistake, it should be prominently stated on each page of the ephemerides that mean time reckoned from mean midnight is kept throughout.
His tables of the moon are those now used for predicting the places of the moon in all the ephemerides of the world.
From Side-Lights on Astronomy and Kindred Fields of Popular Science by Newcomb, Simon
The vital ideas of the present danced by in thin-winged progress unperceived, or rather perceived as bloodless and irresolute ephemerides.
From Sinister Street, vol. 2 by MacKenzie, Compton
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
