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View synonyms for ephemeris

ephemeris

[ ih-fem-er-is ]

noun

, plural e·phe·mer·i·des [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.


ephemeris

/ ɪˈfɛmərɪs /

noun

  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
“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


ephemeris

/ ĭ-fĕmər-ĭs /

, Plural ephemerides ĕf′ə-mĕrə-dēz′

  1. 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.


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Word History and Origins

Origin of ephemeris1

1545–55; < Latin ephēmeris day book, diary < Greek ephēmerís diary, account book, derivative of ephḗmeros; ephemeral
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Word History and Origins

Origin of ephemeris1

C16: from Latin, from Greek: diary, journal; see ephemeral
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Example Sentences

In the 1790s, he calculated ephemerides, predictions about the future positions of the sun, the moon, the planets and the stars over the course of the coming year.

Not surprisingly, with such traumatic lessons, scientists have sweated over getting the ephemerides of solar-system objects pinned down better and better.

Dictys (the full title of whose book is Ephemeris Belli Trojani) is not only the longer but the better written of the two.

For instance, under the entry newspaper occurs the attractive word ephemeris.

Knowing the location of Venus in the sky, which can be ascertained from the Ephemeris, the observer can find it by day.

Take in hand, then, the Ephemeris for the year of your birth and read this chapter with it in view.

Possibly the Latin Ephemeris was the work of Septimius himself.

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ephemeridephemeris second