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A polar circle is a geographic term for a conditional circular line (arc) referring either to the Arctic Circle or the Antarctic Circle. These are two of the keynote circles of latitude (parallels). On Earth, the Arctic Circle is currently drifting northwards at a speed of about 14.5 m per year and is now at a mean latitude (i.e. … 展开
The polar circles would almost precisely match the boundaries for the zones where the polar night and the polar day would occur throughout the winter solstice and 展开
CC-BY-SA 许可证中的维基百科文本 Arctic Circle - Wikipedia
46 行 · The Arctic Circle is one of the two polar circles, marking the boundary …
查看en.wikipedia.org的所有46行COORDINATES(APPROXI… COUNTRY, TERRITORY, O… NOTES 66°34′N 0°0′E / 66.567°… Atlantic Ocean Norwegian Sea 66°34′N 12°3′E / 66.567… Norway Islands and skerries of Træn… 66°34′N 12°18′E / 66.56… Atlantic Ocean Trænfjorden [no], Norwegian … 66°34′N 12°29′E / 66.56… Norway Islands and skerries of Nesøy…
Arctic Circle | Latitude, History, & Map | Britannica
5 天之前 · The Arctic Circle is a parallel of latitude that marks the southern limit of the area with extreme seasonal variations of daylight and darkness. Learn about its geography, geology, climate, and human activities in this article from …
极圆 - 百度百科
- 数学术语
极圆(polar circle)是以三角形的垂心为中心、以这一三角形为自配极三角形的圆，称为该三角形的极圆。当三角形是钝角三角形、直角三角形或锐角三角形时，它的极圆分别是实圆、点圆或虚圆 。
- 数学术语
Arctic Circle: What It Means & Why It Matters - Life in Norway
2023年11月7日 · Learn what the Arctic Circle means geographically and culturally, and how it affects life and travel in Norway. Discover the midnight sun, polar night, northern lights, and …
Weird Science: Polar Circles and Tropical Circles
Learn about the four circles of latitude that mark the sun's extreme positions on the earth: the polar circles at 66.6° N and S, and the tropic circles at 23.4° N and S. Find out how the axial …
Polar circle - Simple English Wikipedia, the free encyclopedia
Learn about the Arctic Circle and the Antarctic Circle, two lines of latitude that mark the boundary of the polar regions. Find out how the sun's position affects the day and night length …
The Arctic Circle: Polar portal to the Arctic - Live Science
2020年7月8日 · Learn about the Arctic Circle, an imaginary line of latitude that marks the southern border of the Arctic region. Discover its geography, climate, wildlife, phenomena and climate change impacts.
Polar regions of Earth - Wikipedia
Learn about the polar regions of Earth, the high latitudes that surround the North and South Poles and are dominated by ice and snow. Find out the definitions, climate, and features of the Arctic and Antarctic, and the countries and …
Polar Circle -- from Wolfram MathWorld
2024年10月24日 · Any two polar circles of an orthocentric system are orthogonal. The polar circles of the triangles of a complete quadrilateral constitute a coaxal system conjugate to that of the circles on the diagonals. The polar triangle of …
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