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английский) 2:
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Both day and night change their duration during the year. Long summer day, in the winter it becomes a long night. And this is due to the fact that the earth revolves around the sun while lying on the side a little bit, that is, the earth's axis is inclined to the orbital plane, and not perpendicular to it. In summer, the sun shines most of the northern hemisphere and the longer the time, but in the southern hemisphere it is just not enough - there begins the Antarctic polar night. In winter, the earth rolls over to the other side and has the northern hemisphere is not enough sun, the polar night comes at us in the Arctic Circle, and the rest of the dark well-read before. The turning point comes on December 22 when a sunny day minimum
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