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- Q202490 subject Q8911859.
- Q202490 abstract "A polar circle is either the Arctic Circle or the Antarctic Circle. On Earth, the Arctic Circle is located at a latitude of °′″ N, and the Antarctic Circle is located at a latitude of °′″ S.Areas between each polar circle and its associated pole (North Pole or South Pole), known geographically as the frigid zones, would theoretically experience at least one 24-hour period when the sun is continuously above the horizon and at least one 24-hour period when the sun is continuously below the horizon annually. However, due to atmospheric refraction and the Sun being an extended object rather than a point source, the continuous daylight area is somewhat extended while the continuous darkness area is somewhat reduced.The latitude of the polar circles is 90 degrees minus the axial tilt of the Earth's axis of daily rotation relative to the ecliptic, the plane of the Earth's orbit. This tilt varies slightly, a phenomenon described as nutation. Therefore, the latitudes noted above are calculated by averaging values of tilt observed over many years. The axial tilt also exhibits long-term variations as described in the reference article (a difference of 1 second of arc in the tilt is equivalent to change of about 31 metres north or south in the positions of the polar circles on the Earth's surface).".
- Q202490 thumbnail Polarkreis_Finnland_1975.jpg?width=300.
- Q202490 wikiPageWikiLink Q1303849.
- Q202490 wikiPageWikiLink Q1753196.
- Q202490 wikiPageWikiLink Q176609.
- Q202490 wikiPageWikiLink Q179745.
- Q202490 wikiPageWikiLink Q182657.
- Q202490 wikiPageWikiLink Q190009.
- Q202490 wikiPageWikiLink Q190991.
- Q202490 wikiPageWikiLink Q193372.
- Q202490 wikiPageWikiLink Q2.
- Q202490 wikiPageWikiLink Q2299642.
- Q202490 wikiPageWikiLink Q25322.
- Q202490 wikiPageWikiLink Q254634.
- Q202490 wikiPageWikiLink Q2552709.
- Q202490 wikiPageWikiLink Q309372.
- Q202490 wikiPageWikiLink Q34027.
- Q202490 wikiPageWikiLink Q43261.
- Q202490 wikiPageWikiLink Q51.
- Q202490 wikiPageWikiLink Q60670.
- Q202490 wikiPageWikiLink Q774621.
- Q202490 wikiPageWikiLink Q79852.
- Q202490 wikiPageWikiLink Q8911859.
- Q202490 wikiPageWikiLink Q933.
- Q202490 wikiPageWikiLink Q934.
- Q202490 comment "A polar circle is either the Arctic Circle or the Antarctic Circle.".
- Q202490 label "Polar circle".
- Q202490 depiction Polarkreis_Finnland_1975.jpg.