Sidereal time
Pronunciation: /ˈsaɪdˈɹiɫ ˈtaɪm/
Sidereal time (noun)
- A way of measuring time by how far Earth has rotated compared with distant stars.
- Time used to help astronomers aim instruments at objects, based on Earth’s rotation relative to stars.
Examples
- Sidereal time helps track the sky using stars instead of the Sun.
- When sidereal time changes, the stars appear to shift across the sky.