Midnight Sun
Related Category: Astronomy: General
phenomenon in which the sun remains visible in the sky continuously for 24 hr or longer, occurring only in the polar regions.
midnight sun
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Midnight sun
The midnight sun is a natural phenomenon occurring in latitudes north and nearby to the south of the Arctic Circle, and south and nearby to the north of the Antarctic Circle where the sun remains visible at the local midnight....
You've heard of Alaska's nickname, "land of the midnight sun?" That's an apt description-but only in summer. Around December 21, the day of the winter solstice, winter begins here in the northern hemisphere.
This simulation of the midnight sun was made using the Starry Night program with a "fisheye lens" perspective to show a wide (180 degree) region of the sky from a vantage point at the North Pole on July 4, 1996.
Caption: Shortly after midnight Sunday morning (5 April 1998 12:39 AM PST), the Mars Orbiter Camera (MOC) on the Mars Global Surveyor (MGS) spacecraft successfully acquired a high resolution image of the 'Face on Mars' feature in the Cydonia region.
That is the midnight sun or midsummernight sun or polar day. On the other hand, places at latitude 66.
Before Arrhenius submitted that article, he spent a year calculating the expected effects of an increase in carbon dioxide. That story is told in "Land of the Midnight Suns" be Fred Pearce, p. 50-51 in the New Scientist, 25 January 2003.
At those places, near the time of the "midnight sun," it is possible to see the crescent moon above the horizon near midnight.) ...
Conversely, at northern latitudes φ > 0, celestial objects with a declination greater than 90° - φ, are always visible. Such stars are called circumpolar stars, while the phenomenon of a sun not setting is called midnight sun.
 See also: Midnight, Sun, Night, Day, Earth
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