地理極點
地理極點係行星、衛星或其它較大天體嘅自轉軸同佢表面交會嘅點。例如地球上嘅北極同南極，其它天體嘅極亦稱為南極同北極，分別會喺個天體赤道兩側各90度之處。每個行星都有地理極點。
天體自轉嘅攝動意味地理極點會喺佢表面上稍為徘迴。例如，地球嘅南北極喺幾年內會郁幾米。當製圖需要精確同不變嘅座標，[未記出處或冇根據]地理極點嘅平均位置作為固定嘅製圖桿，成為物體大圓經度嘅交會點。
參考
睇埋
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