2006-08-27 16:58:22 · 6 answers · asked by Sam P 1 in Science & Mathematics ➔ Astronomy & Space
A table providing the positions (given in a Cartesian coordinate system, or in right ascension and declination or, for astrologers, in longitude along the zodiacal ecliptic), of the Sun, the Moon, the planets, asteroids or comets in the sky at a given moment in time;
For scientific uses, a modern planetary ephemeris comprises software that generates positions of the planets and often of their satellites, or of asteroids or comets at virtually any time desired by the user. Often there is an option to find the velocities of the bodies of interest, as well.
2006-08-27 17:01:27 · answer #1 · answered by Anonymous · 0⤊ 0⤋
In Global Positioning Systems(GPS) ,ephemeries are the coordinates (x,y,z) of our location in the Earth that we recieve via satellite platform.The changes of these parameters are a function of time(t).
2006-08-27 18:14:38 · answer #2 · answered by mehrdad_ansary 1 · 0⤊ 0⤋
Definition - ephemeris
Ephemeris an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year; "today computers calculate the ephemerides"
2006-08-27 17:39:47 · answer #3 · answered by hamdi_batriyshah 3 · 0⤊ 0⤋
A highly accurate astronomical system for the measurement of time based on the period of Earth's orbit, but in practice relying on.
Also used to calculate a Comet's orbit.
2006-08-28 18:47:04 · answer #4 · answered by spaceprt 5 · 0⤊ 0⤋
"An ephemeris is a table listing the spatial coordinates of celestial bodies and spacecraft as a function of time. "
http://www.google.com/search?hl=en&q=define%3Aephemeris&btnG=Google+Search
2006-08-27 17:01:23 · answer #5 · answered by Jay T 3 · 0⤊ 0⤋
astronomical almanac or table (calendar)
2006-08-27 17:06:27 · answer #6 · answered by tatal_nostru2006 5 · 0⤊ 0⤋