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Why does the sun set? It's because hot air rises. The sun's hot in the middle of the day, so it rises high in the sky. In the evening then, it cools down and sets. Why does it go from east to west? Solar wind. Dear!
Calvin asks Dad why the sun sets. Dad explains that hot air rises, so the sun rises in the middle of the day. In the evening, it cools down and sets. Calvin asks why it goes from east to west. Dad replies 'solar wind'. Mom yells at Dad.