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The 24 hours of summer daylight is known as the midnight sun that is famous in some northern countries. To the north, the Arctic Circle marks this 23.44° boundary. To the south, the Antarctic Circle marks the boundary. These boundaries correspond to 66.56° north or south latitude, respectively.
A contour plot of the hours of daylight as a function of latitude and day of the year, using the most accurate models described in this article. It can be seen that the area of constant day and constant night reach up to the polar circles (here labeled "Anta. c." and "Arct. c."), which is a consequence of the earth's inclination.
Places on the Arctic Circle have the longest total annual daytime, 4,647 hours, while the North Pole receives 4,575. Because of elliptic nature of the Earth's orbit, the Southern Hemisphere is not symmetrical: the Antarctic Circle, with 4,530 hours of daylight, receives five days less of sunshine than its antipodes.
The solstices are the dates that the Sun stays farthest away from the zenith but also in those cases it's high in the sky, reaching an altitude of 66.56° either to the north or the south. All days of the year, solstices included, have the same length of 12 hours. Solstice day arcs as viewed from 20° latitude. The Sun culminates at 46.56 ...
The 55th parallel south is a circle of latitude that is 55 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, the Indian Ocean, the Pacific Ocean and South America. At this latitude the sun is visible for 17 hours, 22 minutes during the December solstice and 7 hours, 10 minutes during the June solstice. [1]
It crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, North America, the Caribbean, and the Atlantic Ocean. At this latitude the sun is visible for 13 hours, 25 minutes during the summer solstice and 10 hours, 51 minutes during the winter solstice. [1]
As the southern hemisphere celebrates the start of summer, those north of the equator will experience its opposite, the first day of winter. This year, it falls on Saturday 21 December at 9:21am ...
The 64th parallel south is a circle of latitude that is 64 degrees south of the Earth's equatorial plane. It crosses the Southern Ocean and the Antarctic mainland, the latter as the most northern latitude. At this latitude the sun is visible for 21 hours, 1 minute during the December solstice and 4 hours, 12 minutes during the June solstice. [1]