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  1. celestial sphere

    • IPA[səˈlesCHəl]
    • n.
      an imaginary sphere of which the observer is the center and on which all celestial objects are considered to lie.
    • noun: celestial sphere, plural noun: celestial spheres

    • 更多解釋
    • n.
      an imaginary sphere of which the observer is the centre and on which all celestial objects are ...

    Oxford Dictionary

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