Sidereal time

/saɪˈdɪə.riəl taɪm/ noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Time measured by the apparent diurnal motion of the vernal equinox; approximated by that based on the rotation of planet Earth relative to the seemingly fixed stars. uncountable
  2. 2
    measured by the diurnal motion of stars wordnet