The cause for the birth season
photo shows the world in a different season
cycle occurs because the Earth axis tilt tilting angle approx. 23.5 degrees to the plane of rotation of the Earth. As a result, during the period of night and day, as well as to absorb the energy from the Sun varies in each of the years. On the southern hemisphere is away from the Sun as much as possible, that is, as the southern hemisphere's winter, which is the shortest day.
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