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sidereal time noun

  /saɪ.ˈdɪə.riəl taɪm/ , /səɪ.ˈdɪə.riəl taɪm/
  • (astronomy) 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.
 temps sidéral
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