![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/14/%25D0%259F%25D0%25BE%25D0%25BB%25D1%258F%25D1%2580%25D0%25BD%25D1%258B%25D0%25B9_%25D0%25B4%25D0%25B5%25D0%25BD%25D1%258C_%25D0%25BD%25D0%25B0%25D0%25B4_%25D0%25BE%25D0%25B7._%25D0%259E%25D0%25B6%25D0%25BE%25D0%25B3%25D0%25B8%25D0%25BD%25D0%25BE.jpg/640px-%25D0%259F%25D0%25BE%25D0%25BB%25D1%258F%25D1%2580%25D0%25BD%25D1%258B%25D0%25B9_%25D0%25B4%25D0%25B5%25D0%25BD%25D1%258C_%25D0%25BD%25D0%25B0%25D0%25B4_%25D0%25BE%25D0%25B7._%25D0%259E%25D0%25B6%25D0%25BE%25D0%25B3%25D0%25B8%25D0%25BD%25D0%25BE.jpg&w=640&q=50)
极昼
在午夜時有日光照耀的季節性自然現象 / 维基百科,自由的 encyclopedia
极昼(英语:Polar day)又称永昼、白昼、日昼,俗称午夜太阳(英语:Midnight sun),是发生在北极圈以北或南极圈以南的夏季月份发生的自然现象,在当地时间午夜时分依然能够看见太阳。在北极看到午夜太阳时,太阳似乎从左向右移动。而在南极,相对应的视觉运动是从右向左。这种现象发生在北纬65°44'到90°和南纬65°44'到90°的地方,但由于折射的影响,并不会在准确的北极圈或南极圈处停止。
此条目翻译品质不佳。 (2018年12月11日) |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/14/%D0%9F%D0%BE%D0%BB%D1%8F%D1%80%D0%BD%D1%8B%D0%B9_%D0%B4%D0%B5%D0%BD%D1%8C_%D0%BD%D0%B0%D0%B4_%D0%BE%D0%B7._%D0%9E%D0%B6%D0%BE%D0%B3%D0%B8%D0%BD%D0%BE.jpg/640px-%D0%9F%D0%BE%D0%BB%D1%8F%D1%80%D0%BD%D1%8B%D0%B9_%D0%B4%D0%B5%D0%BD%D1%8C_%D0%BD%D0%B0%D0%B4_%D0%BE%D0%B7._%D0%9E%D0%B6%D0%BE%D0%B3%D0%B8%D0%BD%D0%BE.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Midnight_sun.jpg/640px-Midnight_sun.jpg)
相反的现象是极夜,它发生在冬季,当时太阳整天都会留在地平线以下不可见。