celestial spheres

/S AH0 L EH1 S CH AH0 L S F IH0 R Z/
noun
  1. 1

    An abstract sphere of infinite radius which serves as the imaginary backdrop for celestial objects, and of which the visible sky is one hemisphere.

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Source: https://en.wiktionary.org/wiki/celestial%20sphere, https://en.wiktionary.org/wiki/celestial%20spheres