Description: 天球是一個假想的空心球殼，其半徑無限大，可以地球、太陽或任何便利的地方為中心。在表觀上，天體附著在天球內部，而行星、太陽和月球在天球上緩慢移動。天球這一概念被用於球面坐標系。由於地球的自轉，天球在表觀上每天轉動一週。
Related Terms:
天球坐標
天極
地平
天頂
日
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Term and definition status:
The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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