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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A table giving the coordinates of a celestial body at a number of specific times during a given period.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A journal or diary.
  • n. A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination
  • n. Software that calculates the apparent position of celestial bodies.

from the GNU version of the Collaborative International Dictionary of English

  • n. A diary; a journal.
  • n.
  • n. A publication giving the computed places of the heavenly bodies for each day of the year, with other numerical data, for the use of the astronomer and navigator; an astronomical almanac.”
  • n. Any tabular statement of the assigned places of a heavenly body, as a planet or comet, on several successive days.
  • n. A collective name for reviews, magazines, and all kinds of periodical literature.

from The Century Dictionary and Cyclopedia

  • n. A daily record; a diary; a chronological statement of events by days; particularly, an almanac; a calendar: in this sense formerly sometimes with the plural as singular.
  • n. In astronomy, a table or a collection of tables or data showing the daily positions of the planets or heavenly bodies, or of any number of them; specifically, an astronomical almanac, exhibiting the places of the heavenly bodies throughout the year, and giving other information regarding them, for the use of the astronomer and navigator.
  • n. Anything lasting only for a day or for a very brief period; something that is ephemeral or transient; especially, a publication or periodical of only temporary interest or very short duration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year


Late Latin ephēmeris, from Greek, diary, from ephēmeros, daily; see ephemeral.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Modern Latin, from Ancient Greek ἐφημερίς ("diary, calendar"), from ἐφήμερος ("daily"). (Wiktionary)


  • Astronomy & Astrophysics says the team "presents an accurate, long-term ephemeris," and that "they participated in all the steps of a real research program, from initial observations to the publication process, and the result they obtained bears scientific significance."

    High School Students Get Published in Astrophysics Journal | Universe Today

  • Just as in a circle, it is necessary to know three points to determine the circumference; so in ascertaining the elements of a comet, three different positions must be observed before what astronomers call its "ephemeris" can be established.

    Off on a Comet

  • If Cassini lasts til 2012, then they will have tracked Saturn for one quarter of its orbit, providing excellent data for the ephemeris.

    Archive 2009-01-08

  • Well, it turns out that an accurate ephemeris (position table) of Saturn is useful for solar system tests of general relativity, predicting future occultations and eclipses, and navigation of spacecraft.

    Archive 2009-01-08

  • “Your ephemeris,” she says, finally, with a fair amount of bravado.

    Vivian Rising

  • Still, she pulls out another chart and starts to scribble what she reads on the ephemeris.

    Vivian Rising

  • I sat with an open book, dragging my finger across the ephemeris boxes, scratching my head at logarithms.

    Vivian Rising

  • She looks up at me with a knowing smile: “This, my dear, is the ephemeris.”

    Vivian Rising

  • Ficino grumbled about it good-naturedly but retrieved a valuable ephemeris while doing so, a gift from Cosimo.

    The Poet Prince

  • Check here to get the ephemeris of the object from the Solar System Dynamics website.

    Asteroid or Space Junk? Object Makes Close Pass by Earth Wednesday | Universe Today


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  • (n): a tabular statement of the assigned places of a celestial body for regular intervals. In book form, used by astrologers for accurate data when compiling astrological charts or horoscopes

    January 21, 2008