sidereal time

1. 1.

   measured by the diurnal motion of stars

   Broadercosmic time

   Narrowersidereal daysidereal yearsidereal hoursidereal month

Questions about sidereal time

What does sidereal time mean?

sidereal time means "measured by the diurnal motion of stars".

Is sidereal time a common word?

sidereal time is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.