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ice on rocks
Perihelion is the day each year when the Earth is at its closest distance to the Sun. You might expect that perihelion should happen in the summer, when it is warmest, and you would be right, but there is ice outside. How can that be?

Answer:

Perihelion happens during the winter in the Northern Hemisphere, but we often forget that it is summer in the Southern Hemisphere. If perihelion caused the seasons, then the entire Earth would be having the same season at the same time. Instead, the tilt of the Earth gives us our seasons, with the hemisphere that is tilted towards the Sun having summer, and the hemisphere that is tilted away having winter.
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