sidereal

alternative sideral · alternative sidaereal

1. not comparableOf or relating to the stars.

   The field of sidereal astronomy, therefore, was virtually untrodden when, shortly after the beginning of his telescopic work, Herschel began his first review of the heavens.

   1919, Hector Macpherson, “Chapter V”, in S.Chapman (series editor), editor, Men of Science: Herschel

   1 more example

   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?

   1831, Thomas Carlyle, “Reminiscences”, in Sartor Resartus: The Life and Opinions of Herr Teufelsdröckh. […], London: Chapman and Hall, […], →OCLC, 1st book, page 14

2. not comparableastronomyRelating to a measurement of time relative to the position of the stars.

   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.

   1903, Percival Lowell, “Chapter I”, in The Solar System

3. not comparableastronomyRelating to a measurement of time relative to the point of the vernal equinox.