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The Collaborative International Dictionary

Ephemeris \E*phem"e*ris\, n.; pl. Ephemerides. [L., a diary, Gr. ?, also, a calendar, fr. ?. See Ephemera.]

  1. A diary; a journal.

  2. (Anat.)

    1. 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; as, the ``American Ephemeris and Nautical Almanac.''

    2. Any tabular statement of the assigned places of a heavenly body, as a planet or comet, on several successive days.

  3. (Literature) A collective name for reviews, magazines, and all kinds of periodical literature.
    --Brande & C.

Douglas Harper's Etymology Dictionary

table showing predicted positions of heavenly bodies, 1550s, Modern Latin, from Greek ephemeris "diary, journal, calendar," from ephemeros "daily" (see ephemera). The classical plural is ephemerides.


n. 1 (context obsolete singular or plural English) A journal or diary. 2 (context astronomy English) A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination 3 Software that calculates the apparent position of celestial bodies.

  1. n. an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year; "today computers calculate the ephemerides"

  2. [also: ephemerides (pl)]


In astronomy and celestial navigation, an ephemeris (plural: ephemerides; from Latinephemeris, "diary", from , , "diary, journal") gives the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times. Historically, positions were given as printed tables of values, given at regular intervals of date and time. Modern ephemerides are often computed electronically from mathematical models of the motion of astronomical objects and the Earth. Even though the calculation of these tables was one of the first applications of mechanical computers, printed ephemerides are still produced, as they are useful when computational devices are not available.

The astronomical position calculated from an ephemeris is given in the spherical polar coordinate system of right ascension and declination. Some of the astronomical phenomena of interest to astronomers are eclipses, apparent retrograde motion/planetary stations, planetary es, sidereal time, positions for the mean and true nodes of the moon, the phases of the Moon, and the positions of minor celestial bodies such as Chiron.

Ephemerides are used in celestial navigation and astronomy. They are also used by some astrologers.

Usage examples of "ephemeris".

Paullini and Riedlin, as well as the Ephemerides, speak of different colored hair in the same head, and it is not at all rare to see individuals with an anomalously colored patch of hair on the head.

The Ephemerides records a birth as having occurred during asphyxia, and also one during an epileptic attack.

Or, he is the Faustus, That casteth figures and can conjure, cures Plagues, piles, and pox, by the ephemerides, And holds intelligence with all the bawds And midwives of three shires: while you send in -- Captain!

Ephemerides contains the account of an example of double cecum, and Alexander speaks of a double colon, and there are other cases of duplication of the bowel recorded.

Among the older writers we find Ficker and the Ephemerides giving instances of exophthalmos from vomiting.

Ehrlich, Ficker, Klein, Rodforffer, and the Ephemerides, all record instances in which a large tongue was removed either by ligation or amputation.

Bartholinus, Bauhinus, Cattierus, the Ephemerides, Frank, Panaroli, van der Wiel, and others.

Ephemerides contains an account of a case of hydrocephalus in which there were 24 pounds of fluid, and similar cases have been noted.

There are instances of fecundity at nine years recorded by Ephemerides, Wolffius, Savonarola, and others.

The Ephemerides contains an account of a case in which cystotomy was repeated four times, and there is another record of this operation having been done five times on a man.

Ballonius, Vogel, Morgagni, the anatomist of the kidney, Schenck, Bartholinus, Bierling, Zacchias, Charleton, Mauriceau, Ephemerides, and Fabricius Hildanus.

Zacchias, Amand, Fabricius Hildanus, Graaf, the discoverer of the follicles that bear his name, Borellus, Blegny, Blanchard, Diemerbroeck, Duddell, Mauriceau, a Reyes, Riolan, Harvey, the discoverer of the circulation of the blood, Wolfius, Walther, Rongier, Ruysch, Forestus, Ephemerides, and Schurig all mention cases of conception with intact hymen, and in which there was no entrance of the penis.

Aventii, Fabricius Hildanus, the Ephemerides, and Curry relate instances of a fatal issue following the ingestion of cold water by an individual in a superheated condition.

Bartholinus, Fabricius Hildanus, Pliny, Rhodius, Schenck, Marcellus Donatus, Riedlin, and Garengeot speak of death from fright and fear, and the Ephemerides describes a death the direct cause of which was intense shame.

Bartholinus, Paullinus, Blanchard, Bonet, the Ephemerides, Fabricius Hildanus, Horstius, Morgagni, Peyer, Rhodius, Vogel, Salmuth, Percy, Laurent, and others describe it.