ephemeris

An ephemeris is a table or data set that provides the positions of celestial objects, such as planets and stars, at specific times. It is used in astronomy, navigation, and space exploration to determine where these objects will be in the sky at any given moment. By referencing an ephemeris, scientists and navigators can accurately track the movement of planets, spacecraft, and other celestial bodies as they orbit and move through space, ensuring precision in calculations and observations.