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单词 celestial sphere
释义

WordReference Random House Unabridged Dictionary of American English © 2024
celestial sphere, 
  1. Astronomythe imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position.
  • 1875–80

Collins Concise English Dictionary © HarperCollins Publishers::
celestial sphere n
  1. an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface
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