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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 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 ...
Civil polar twilight occurs at latitudes between about 67°24' and 72°34' North or South, where the Sun will be below the horizon all day on the winter solstice, but by less than 6° at solar noon. There is then no true daylight at the solar culmination, only civil twilight. During civil polar twilight, there is still enough light for most ...
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]
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 ...
For instance, in Fairbanks, Alaska, which is south of the Arctic Circle, the Sun sets at 12:47 a.m. at the summer solstice. This is because Fairbanks is 51 minutes (1 hour and 51 minutes at Daylight Savings Time) ahead of its idealized time zone (as most of the state is in one time zone) and Alaska observes daylight saving time.
The number of daylight hours depends on the latitude and time of year. Each pole has continuous daylight near its summer solstice. Carpet plot of sunshine at latitude 70° north Carpet plot of sunshine at latitude 50° north Carpet plot of sunshine at the equator Twilight at Paranal Observatory in Chile [14]