Sidereal time

//saɪˈdɪə.riəl taɪm// noun

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

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