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。[1]每個行星都有地理極點。[2]
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。[3][4]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
[編輯]- ↑ Kotlyakov, Vladimir; Komarova, Anna (2006). Elsevier's Dictionary of Geography: in English, Russian, French, Spanish and German. p. 557. 喺22 June 2015搵到.
- ↑ Hooper, William (2008). Aether and Gravitation. p. 224. 喺22 June 2015搵到.
- ↑ Schar, Ray (2010). Wonderfully Weird World. p. 106. 喺22 June 2015搵到.
- ↑ Lovett, Richard A. (2013-05-14). "Climate Change Has Shifted the Locations of Earth's North and South Poles". Scientificamerican.com. 喺2015-06-26搵到.
- ↑ "20 Things You Didn't Know About... the North Pole". DiscoverMagazine.com. 2014-11-18. 喺2015-06-26搵到.
睇埋
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