Ephemeris

In astronomy and celestial navigation, an ephemeris (; pl. ephemerides ; from Latin ephemeris 'diary', from Ancient Greek ἐφημερίς (ephēmerís) 'diary, journal') is a book with tables that gives the trajectory of naturally occurring astronomical objects and 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. GPS signals include ephemeris data used to calculate the position of satellites in orbit.

Ephemeris Classic Tracks, Vol. 2 - 2024-11-15T00:00:00.000000Z

Classic Tracks, Vol. 1 - 2021-05-24T00:00:00.000000Z

Reach - 2024-01-22T00:00:00.000000Z

Checkpoint - 2023-06-05T00:00:00.000000Z

Stardust - 2023-01-16T00:00:00.000000Z

A New Era - 2022-05-16T00:00:00.000000Z

Satellite Racer - 2022-01-03T00:00:00.000000Z

On a Planet Without Life - 2021-09-03T00:00:00.000000Z

Bending Gates - 2021-08-16T00:00:00.000000Z

Maelstrom - 2021-02-15T00:00:00.000000Z

Mind over Matter - 2020-11-27T00:00:00.000000Z

Another Path - 2020-11-16T00:00:00.000000Z

Bodhi - 2020-09-21T00:00:00.000000Z

Cabalistic - 2020-06-01T00:00:00.000000Z

Cabalistic - 2020-05-04T00:00:00.000000Z

Aqua pura - 2020-04-12T00:00:00.000000Z

Eruption - 2020-03-27T00:00:00.000000Z

Voodoo - 2019-11-25T00:00:00.000000Z

Omen - 2019-09-15T00:00:00.000000Z

Omen - 2019-09-15T00:00:00.000000Z

Galaxy Harbor - 2019-06-03T00:00:00.000000Z

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