词条 天极

描述: 南北两天极被定义为地球自转轴与天球的交点。在地球的北极，北天极总是在正上方；而在地球的南极，南天极总是在正上方。由于地球自转，北半球的天空似乎围绕着北天极旋转，而南半球的天空似乎围绕着南天极旋转。北天极的赤纬为+90度，而南天极的赤纬为-90度。

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天球坐标

地轴

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