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極運動は複雑な運動で、その観測は重要である。現在[[国際地球回転・基準系事業]](IERS)によって世界中の観測所が協力して極の動きを監視している<ref>{{Cite web |url= http://hpiers.obspm.fr/eop-pc/index.php?index=mission&lang=en&change_lang=true |title=IERS EOP - Observatoire de Paris |accessdate=2014-02-02 |author=Observatoire de Paris |authorlink=パリ天文台 |date=2014-02-02 |year=2014 |format=html |work=IERS EOP - Observatoire de Paris |publisher=Observatoire de Paris |quote=Polar motion over recent year |language=[[英語]]}}</ref>。右の図はIERSの発表した北極の位置をプロットしたものである。真の北極は428日の周期で反時計まわりに回っていることが分かる。将来の極の位置は大体の見当をつけることはできるものの、正確な値は実際に観測をすることでしか今のところわからない。
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