ephemeris
[ ih-fem-er-is ]
/ ɪˈfɛm ər ɪs /
noun, plural e·phe·mer·i·des [ef-uh-mer-i-deez] /ˌɛf əˈmɛr ɪˌdiz/.
a table showing the positions of a heavenly body on a number of dates in a regular sequence.
an astronomical almanac containing such tables.
Archaic.
an almanac or calendar.
Origin of ephemeris
1545–55; < Latin
ephēmeris day book, diary < Greek
ephēmerís diary, account book, derivative of
ephḗmeros; see
ephemeral
Words nearby ephemeris
ephelis,
ephemera,
ephemeral,
ephemerality,
ephemerid,
ephemeris,
ephemeris second,
ephemeris time,
ephemeron,
ephemeropteran,
ephemerous
Example sentences from the Web for ephemeris
British Dictionary definitions for ephemeris
ephemeris
/ (ɪˈfɛmərɪs) /
noun plural ephemerides (ˌɛfɪˈmɛrɪˌdiːz)
a table giving the future positions of a planet, comet, or satellite
an annual publication giving the positions of the sun, moon, and planets during the course of a year, information concerning eclipses, astronomical constants, etc
obsolete
a diary or almanac
Word Origin for ephemeris
C16: from Latin, from Greek: diary, journal; see
ephemeral
Scientific definitions for ephemeris
ephemeris
[ ĭ-fĕm′ər-ĭs ]
Plural ephemerides (ĕf′ə-mĕr′ə-dēz′)
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.