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Sidereal

//saɪˈdɪɚ.i.əl// adj

Definitions

Adjective
  1. 1
    Of or relating to the stars. not-comparable

    "These fringes of lamplight, struggling up through smoke and thousandfold exhalation, some fathoms into the ancient reign of Night, what thinks Boötes of them, as he leads his Hunting-Dogs over the Zenith in their leash of sidereal fire?"

  2. 2
    Relating to a measurement of time relative to the position of the stars. not-comparable

    "Then, from a sufficient number of observations of synodic periods to give their mean, we obtain the sidereal period, or period with reference to the stars."

  3. 3
    Relating to a measurement of time relative to the point of the vernal equinox. not-comparable
Adjective
  1. 1
    (of divisions of time) determined by daily motion of the stars wordnet
  2. 2
    of or relating to the stars or constellations wordnet

Etymology

From Latin sīdereus + -al (cf. Latin sīderālis), from sīdus (“star, constellation”), of unknown ultimate origin, likely a substrate language such as Pre-Greek.

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