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In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ə r ə s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛ r ə d iː z /; 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 ...
Apr 12, 2024 · The meaning of EPHEMERIS is a tabular statement of the assigned places of a celestial body for regular intervals.
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.
At its core, ephemeris data provides essential information about the precise location of GNSS satellites orbiting the Earth. This data includes the satellite's position, speed, and status, which are critical for calculating accurate positions on the ground.
ephemeris Definition. An ephemeris is a tabulation of computed positions and velocities (and/or various derived quantities such as right ascension and declination) of an orbiting body at specific times. The plural form of ephemeris is ephemerides.
Historically, the term “ephemeris” referred to a printed table of position coordinates at discrete instants, but is now extended to modern computational concepts like representations in time-continuous polynomial data-files.
The JPL Horizons on-line ephemeris system provides access to solar system data and customizable production of accurate ephemerides for observers, mission-planners, researchers, and the public, by numerically characterizing the location, motion, and observability of solar system objects as a function of time, as seen from locations within the ...
