On late October, November, December, January, and two weeks of February are never get dark. Those guys were hard of sleeping during the midnight sun. On June, the sky was completely dark with many several stars.
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The months that you mention, October through February, would be winter in the Northern Hemisphere, and summer in the Southern Hemisphere, of which Antarctica is a prominent feature. Therefore, it doesn't get dark in December in Antarctica because of the 23.5 degree tilt of the Earth's axis, which promotes many more hours of daylight in that hemisphere.
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Because in the first months you mentioned, the Earth is tilted towards Sun by its south hemisphere, by 23,5°, so the Antarctic is constantly illuminated.
It's the opposite in the other months.
See ----> http://visual.merriam-webster.com/images…
It's the opposite in the other months.
See ----> http://visual.merriam-webster.com/images…