celestial sphere
柯林斯词典
1. N an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface 天球; 一个想像假设的包含了整个宇宙的无限大球体，故所有天体都能展示在其表面上
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1. N an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface 天球; 一个想像假设的包含了整个宇宙的无限大球体，故所有天体都能展示在其表面上