Why are there seasons? Most people don't know why we have spring, summer, fall, and winter. Do you? It has nothing to do with Earth's varying distance from the Sun and everything to do with Earth's tilted axis of rotation, which impacts the intensity of light reaching the surface. By analogy, we start by examining a card held out in the rain. How wet the card gets depends upon the angle at which it is held. The angle is everything.
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