ephemerides

e·phem·er·is (

-f

n. pl. eph·e·mer·i·des (

-m

-d

)

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

[Late Latin ephmeris, from Greek, diary, from ephmeros, daily; see ephemeral.]

ephemeris [ɪˈfɛmərɪs]

n pl ephemerides [ˌɛfɪˈmɛrɪˌdiːz]

1. (Astronomy) a table giving the future positions of a planet, comet, or satellite

2. (Astronomy) 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. (Library Science & Bibliography) Obsolete a diary or almanac

[from Latin, from Greek: diary, journal; see ephemeral]

ephemeris (

-f

Plural ephemerides (

-m

-d

)

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.

ephemeris

an astronomical almanac giving, as an aid to the astronomer and navigator, the locations of celestial bodies for each day of the year.

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almanac Almanacs annual astronomy ephemeris time Ephemerist Moon-culminating spent gnat TDT terrestrial dynamical time terrestrial time time unit Tt unit of time yearbook yearly			He also describes, though often in less detail, 218 almanacs, ephemerides, and lumarios published in the Americas during the same period. Mathematical works printed in the Americas, 1554-1700 by SciTech Book News New results on SW Sex stars and a proposed observing campaign David Boyd described his joint project with Dr Gaensicke, designed to update the ephemerides of several eclipsing SW Sextantis stars by timing eclipse minima. Report of the joint meeting of the American Association of Variable ... by Taylor, Melvyn / Journal of the British Astronomical Association In the fifteenth century, however, "almanacs or ephemerides began to be prepared for definite periods, as 30 or 10 years," and beginning around the middle of the sixteenth century, almanacs were compiled for a single year. Marking time: astrology, almanacs, and English Protestantism by Chapman, Alison A. / Renaissance Quarterly			Epenthetic epergne Eperlan epexegesis Epexegetical EPG eph- Eph. epha ephah ephebe ephedra Ephedra sinica Ephedraceae ephedrine ephemera ephemeral Ephemeral fly ephemerality ephemeralness Ephemeran Ephemeric ephemerid Ephemerida Ephemeridae ephemerides ephemeris ephemeris time Ephemerist ephemeron Ephemeroptera ephemeropteran Ephemerous Ephesian Ephesians Ephestia Ephestia elutella Ephesus Ephialtes Ephippial Ephippidae Ephippiorhynchus Ephippiorhynchus senegalensis Ephippium ephod ephor Ephoral Ephoralty Ephraim Ephraimite Ephyra			Ephemeral stream Ephemeral stream Ephemeral stream Ephemeral stream Ephemeral waterbody Ephemeral waterbody Ephemeral waterbody Ephemeral waterbody ephemerality ephemerality ephemerality ephemerality ephemerally ephemerally ephemerally ephemerally ephemeralness ephemeralness ephemeralness ephemeralness ephemerals ephemerals ephemerals ephemerals Ephemeran Ephemeric ephemerid Ephemerida Ephemerida Ephemeridae ephemerides ephemeris ephemeris ephemeris Ephemeris Astronomy Ephemeris Data Ephemeris Data Maintenance ephemeris day Ephemeris Improvement Ephemeris second Ephemeris second ephemeris time ephemeris time ephemeris time Ephemeris Time ET ephemeris times ephemeris times Ephemeris/Attitude Ephemerist ephemerists Ephemeroids ephemeron ephemeron ephemerons Ephemeroptera Ephemeroptera Ephemeroptera, Plecoptera, and Trichoptera ephemeropteran ephemeropteran ephemeropterans ephemeropterans

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