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Definition of: ephemeris
(i·fem′ər·is) noun plural eph·e·mer·i·des (ef′ə·mer′ə·dēz)
1. A table showing the calculated positions and motions of a heavenly body, or of several such bodies, from day to day or at regular intervals.
2. A collection of such tables, or an annual publication giving such tables: an astronomical almanac.
3. Ephemera.
4. Obs. A diary or other diurnal record of events. [<L, a diary <Gk. ephēmeris <ephēmeros. See EPHEMERA.]
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