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
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.
This is the offset to apply to Chariklo’s ephemeris to fit the observations.
From Nature • Apr. 4, 2014
This is a stellar ephemeris, just as packed with facts as an egg is with meat.
From The Ethical Engineer by Harrison, Harry
Armed with these novel powers, he set to work; and the communication in November of his elements and ephemeris for the lost object revived the drooping hopes of the little band of eager searchers.
From A Popular History of Astronomy During the Nineteenth Century Fourth Edition by Clerke, Agnes M. (Agnes Mary)
He will find that these same data, after being partially adopted in the ephemeris for 1900, were thrown out in 1901, and the antiquated ones reintroduced in the main body of the ephemeris.
From The Reminiscences of an Astronomer by Newcomb, Simon
When our ephemeris was first commenced, the corrections applied to existing tables rendered it more accurate than any other.
From Side-Lights on Astronomy and Kindred Fields of Popular Science by Newcomb, Simon
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.
