adjective
- relating to or measured by the stars
Usage: astronomy
Examples
- A sidereal day is about four minutes shorter than a solar day.
- The telescope was calibrated to track sidereal time.
- Astronomers use sidereal measurements to locate celestial objects.
- The sidereal year is based on Earth’s orbit relative to the stars.
- Navigation by sidereal observation was common before GPS.
- The observatory’s clock displayed both solar and sidereal time.