地理極點




地理極點是行星、衛星或其它較大天體的自轉軸與其表面交會的點。如在地球上的北極和南極，其它天體的極也稱為南極和北極，分別會在該天體赤道兩側各90度之處。[1]每一顆行星都有地理極點 。[2]


天體自轉的攝動意味著地理極點會在它的表面上稍稍的徘迴。例如，地球的北極和南極在數年的時間內會有幾米的移動。[3][4]當製圖需要精確和不變的座標，[來源請求]地理極點的平均位置作為固定的製圖桿，成為物體大圓經度的交會點。


如果，像地球，一個天體產生磁場，就會有磁極 。[5]




目录






  • 1 相關條目


  • 2 參考資料


  • 3 误区


  • 4 參見





相關條目


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參考資料





  1. ^ Kotlyakov, Vladimir; Komarova, Anna. Elsevier's Dictionary of Geography: in English, Russian, French, Spanish and German. 2006: 557 [22 June 2015]. 


  2. ^ Hooper, William. Aether and Gravitation. 2008: 224 [22 June 2015]. 


  3. ^ Schar, Ray. Wonderfully Weird World. 2010: 106 [22 June 2015]. 


  4. ^ Lovett, Richard A. Climate Change Has Shifted the Locations of Earth's North and South Poles. Scientificamerican.com. 2013-05-14 [2015-06-26]. 


  5. ^ 20 Things You Didn't Know About... the North Pole. DiscoverMagazine.com. 2014-11-18 [2015-06-26]. 




误区


很多人都认为，地理的两极与磁场的两极是一回事，实则不然。



參見



  • 北極

  • 南極








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