Glossary term: 天球
Description: 天球是一个假想的空心球壳，其半径无限大，可以地球、太阳或任何便利的地方为中心。在表观上，天体附着在天球内部，而行星、太阳和月球在天球上缓慢移动。天球这一概念被用于球面坐标系。
由于地球的自转，天球在表观上每天转动一周。
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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
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