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The extreme sites are the poles, where the Sun can be continuously visible for half the year. The North Pole has midnight sun for about 6 months, from approximately 18 March to 24 September. [2] South Pole, Antarctica has midnight sun and experiences this from approximately 20 September to 23 March (about 6 months). [3]
[3] [6] Beyond 18 degrees, refracted sunlight is no longer visible. [6] True night is defined as the period when the sun is 18 or more degrees below either horizon. [4] Since the atmosphere refracts sunlight, polar day is longer than polar night, and the area that experiences polar night is slightly smaller than the area that experiences polar day.
The Antarctic Circle is the northernmost latitude in the Southern Hemisphere at which the centre of the sun can remain continuously above the horizon for twenty-four hours; as a result, at least once each year at any location within the Antarctic Circle the centre of the sun is visible at local midnight, and at least once the centre of the sun is below the horizon at local noon.
Currently, there is no South Pole Star like Polaris, the so-called North Star. Sigma Octantis is the closest near naked-eye star to the south celestial pole, but at apparent magnitude 5.47 it is barely visible on a clear night, making it less useful for casual navigational or astronomy alignment purposes.
Visible parades of four or five planets only occur every few years, making the cosmic events ones not to be missed for stargazers. Mars, Jupiter and Saturn are frequently seen in the night sky.
That is the midnight sun or midsummer-night sun or polar day. On the other hand, places on the Antarctic Circle (latitude 66.56° south) will see the Sun just on the horizon during midday, and all places south of it will not see the Sun above horizon at any time of the day. That is the polar night. During the December Solstice, the effects on ...
The aurora borealis was visible as far south as Florida on Thursday. ... The night sky in Wisconsin glows with the Northern Lights as a geomagnetic storm brings vibrant pink and green colors to a ...
Because Longyearbyen is above the auroral zone, this natural phenomenon often occurs to the south of us. The lights are visible throughout the long polar night when we experience 24/7 darkness for ...