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Since the last days of November , the arctic regions are in polar night season. They have to say goodbye to the sun. It will shine back again in about two months. Until then, welcome Polar Night!
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Twilight is at noon, the sun trying to peak over the horizon - not succeeding though. But it never gets really dark. In fact there is a kind of permanent twilight, and in full moonlight , the "polar night" days are more enlightened than a dark night at the tropics.
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Christmas night is all along the day...