Ephemeris (plural: Ephemerides)

An ephemeris is a table of the astronomical positions of the celestial bodies, given for specific times. Astrologers use ephemerides that give the positions for every day at midnight (or at noon) Universal Time (UT). Universal Time (UT) is the same as Greenwich Mean Time (GMT).

An almanac that lists the zodiacal positions of the planets and other astronomical data.

The plural of ephemeris is ephemerides.