Because the Earth orbits the Sun in a tilted 23.5 degrees to the north and south pole facing the sun alternately. Thus the thermal energy from the sun that falls on the surface of the earth in various positions in different areas around the world are not the same and do the same period. In the summer, often have a longer than normal time. The sun will rise and fall slowly sensitivity. We have to make solar more than other seasons. In the winter, the sun will come up lazily fall prematurely. Night was longer than the other seasons.
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