The earth has a specific tilt to it. No the sun appears to move towards the north and the south but through all the time the rays of the sun fall directly at the equator but fall at an inclined level at the other places and hence the seasons change and during revolution on basis of the position of the earth to the sun and the tilt the perihelion and aphelion and all other stuff it can be showed that the seasonal changes change with the position of the tilted side but since there is no tilt in the equator therefore, there are no seasonal changes!
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Probably the longest sentence I've ever seen but I don't see a question.