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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.
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]
Sunshine duration follows a general geographic pattern: subtropical latitudes (about 25° to 35° north/south) have the highest sunshine values, because these are the locations of the eastern sides of the subtropical high pressure systems, associated with the large-scale descent of air from the upper-level tropopause. Many of the world's driest ...
The 21st parallel north is a circle of latitude that is 21 degrees north of the Earth's equatorial plane. It crosses Africa , Asia , the Indian Ocean , the Pacific Ocean , North America , the Caribbean , and the Atlantic Ocean .
At 49° north/south latitude (e.g., in Karlsruhe), it varies between 16 equinoctal hours in summer and 8 equinoctial hours in winter. Due to the continuous change of the duration of daylight over the course of the year, the duration of the day division, i.e. the temporal day hours and the temporal night hours, also changes over the year. The ...
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 .
The 56th parallel north is a circle of latitude that is 56 degrees north of the Earth's equatorial plane. It crosses Europe , Asia , the Pacific Ocean , North America , and the Atlantic Ocean . At this latitude the sun is visible for 17 hours, 37 minutes during the summer solstice and 6 hours, 57 minutes during the winter solstice .