The Open Dictionary

sidereal time

noun

UK/saɪˈdɪə.ri.əl ˌtaɪm/
US/saɪˈdɪr.i.əl ˌtaɪm/

Definitions of sidereal time noun

  1. Uncountablephysics

    A time scale based on the Earth's rotation relative to the stars.

    • Astronomers use sidereal time to precisely track the positions of celestial objects.

    • Sidereal time differs from solar time because it considers the Earth's rotation relative to distant stars.

    • A sidereal day is slightly shorter than a solar day due to Earth's revolution around the Sun.