noun
- plural of ephemeris; tables showing the predicted positions of celestial bodies at regular intervals
Usage: astronomy; technical
Examples
- Astronomers consult ephemerides to predict when eclipses will occur.
- The spacecraft’s navigation system relied on accurate ephemerides of the planets.
- Ancient ephemerides helped sailors navigate by the stars.
- Modern ephemerides are calculated using sophisticated computer models.
- The observatory published annual ephemerides for amateur stargazers.
- GPS satellites broadcast ephemerides data to receivers on Earth.