ANSWERS: 2
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It varies, depending on the time of year. On the day of the summer solstice, you can be anywhere north of the Arctic Circle (66.5° N latitude), and the sun will remain above the horizon for the entire day and night. However, during the winter solstice, the sun doesn't rise above the horizon at all. The same conditions exist south of the Antarctic Circle (66.5° S latitude), except, of course that the southern hemisphere's seasons are are reverse that of the northern.
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It's true. I spent 6 months at the northern tip of Ellesmere Island in Canada. When I arrived at the end of August, the sun was always above the horizon - but it was very low in the sky, even at noon. By mid to late September, we had equal parts daylight and dark and by mid October, the sun slipped below the horizon for good..... until March. It was pretty freaky living in a place with no sun.
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