Definition of sidereal in English:


Line breaks: si|der¦eal
Pronunciation: /sʌɪˈdɪərɪəl


  • Of or with respect to the distant stars (i.e. the constellations or fixed stars, not the sun or planets).
    More example sentences
    • Fixed stars continued to be used as reference points throughout the Middle Ages, and even Copernicus measured positions in a sidereal zodiac beginning from the fixed star Mesartim.
    • Slightly brighter today is Alpherg, which is taken as the starting point for the sidereal zodiac.
    • In the first sphere across the zodiac we see twelve sidereal animals.


mid 17th century: from Latin sidereus (from sidus, sider- 'star') + -al.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space