sidereal

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English[edit]

Alternative forms[edit]

Etymology[edit]

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

Pronunciation[edit]

  • (UK) IPA(key): /saɪˈdɪə.ɹi.əl/
  • (US) IPA(key): /saɪˈdɪɚ.i.əl/, /sɪˈdɪɚ.i.əl/
  • (file)
    or
    (file)

Adjective[edit]

English Wikipedia has an article on:
Wikipedia

sidereal (not comparable)

  1. Of or relating to the stars.
    • 1919, Hector Macpherson, “Chapter V”, in S.Chapman (series editor), editor, Men of Science: Herschel:
      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.
  2. (astronomy) Relating to a measurement of time relative to the position of the stars.
    • 1903, Percival Lowell, “Chapter I”, in The Solar System:
      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. (astronomy) Relating to a measurement of time relative to the point of the vernal equinox.

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