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. 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
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."
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.
If Cassini lasts til 2012, then they will have tracked Saturn for one quarter of its orbit, providing excellent data for the ephemeris.
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.
“Your ephemeris,” she says, finally, with a fair amount of bravado.
Still, she pulls out another chart and starts to scribble what she reads on the ephemeris.
I sat with an open book, dragging my finger across the ephemeris boxes, scratching my head at logarithms.
She looks up at me with a knowing smile: “This, my dear, is the ephemeris.”
Ficino grumbled about it good-naturedly but retrieved a valuable ephemeris while doing so, a gift from Cosimo.
Check here to get the ephemeris of the object from the Solar System Dynamics website.
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