Definition, Meaning & Synonyms

ephemeris

noun

/ɪˈfɛm.ər.ɪs/

Definition

A table or data file giving the positions of a celestial object at regular intervals throughout a period.

Examples

The ephemeris indicated that the planet would be visible in the night sky soon.
Astrologers often refer to an ephemeris to calculate the positions of planets during birth charts.
Scientists use ephemerides to predict the orbits of satellites around Earth.

Meaning

In astronomy, an ephemeris is used to describe the positions of astronomical objects relative to time and can be used for navigation or astrological purposes.