ephemerisɪˈfɛm ər ɪs; ˌɛf əˈmɛr ɪˌdiz
ephemeris (n)
English Definitions:
ephemeris (noun)
an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year
"today computers calculate the ephemerides"
ephemeris (Noun)
A journal or diary.
ephemeris (Noun)
A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination
ephemeris (Noun)
Software that calculates the apparent position of celestial bodies.
Ephemeris
In astronomy and celestial navigation, an ephemeris gives the positions of astronomical objects 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 ingresses, sidereal time, positions for the mean and true nodes of the moon, the phases of the Moon, and the position of Chiron and other minor celestial bodies. Ephemerides are used in celestial navigation, astronomy and astrology. Astrologers typically have different needs than astronomers, for example, the calculation of astrological aspects, and may produce ephemerides specialized to their own field.
Ephemeris
In astronomy and celestial navigation, an ephemeris (pl. ephemerides; from Latin ephemeris 'diary', and Greek ἐφημερίς (ephemeris) 'diary, journal') is a book with tables that gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and possibly velocity) over time. Historically, positions were given as printed tables of values, given at regular intervals of date and time. The calculation of these tables was one of the first applications of mechanical computers. Modern ephemerides are often provided in electronic form. However, printed ephemerides are still produced, as they are useful when computational devices are not available. The astronomical position calculated from an ephemeris is often given in the spherical polar coordinate system of right ascension and declination, together with the distance from the origin if applicable. Some of the astronomical phenomena of interest to astronomers are eclipses, apparent retrograde motion/planetary stations, planetary ingresses, 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 astrologers.
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"ephemeris." Kamus.net. STANDS4 LLC, 2024. Web. 28 Mar. 2024. <https://www.kamus.net/english/ephemeris>.
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