ephemeris.

A table or record giving the positions of celestial bodies at specified times.

Use it for

Words that belong together

• orbital ephemeris
• consult an ephemeris

On the page

She checked the ephemeris before committing the ship to the burn.

The damaged ephemeris placed the moon several minutes ahead of its true position.

Usage notes

Primary category: sci-fi. Forms: Singular ephemeris; plural ephemerides. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.