Earth rotates around the Sun's orbit, which takes 365.25 days to complete 1 round each calendar year contains 365 days, which means that there will be 1/4 of the remaining days in each year, every year, there will be a special day, four years is the day 366 of February there will be 29 days instead of 28 days as usual as Cape color discovered Earth's orbit is not a circle. In December, it is located near the Sun, rather than June, it is far from the Sun as much as possible. The world will tilt along axis in June the northern hemisphere is tilted toward the Sun, so the northern hemisphere summer season, and the southern hemisphere is the winter in the month of December will tilt from the Sun. Make the northern hemisphere's winter, and the southern hemisphere's summer. In March and September. The two hemisphere is tilted toward the Sun in the middle of the day and night are of equal length. In March, as the northern hemisphere Spring, and the southern hemisphere is autumn in September. The situation is vice versa.
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