The Earth is flat. It is the rim of a disc, a curved line that arcs back upon itself. If I had time to explain it, you would still need time to understand it.
The polar vortex grows in volume and intensity as the amount of sunlight reaching the northern hemisphere decreases. It is the same in the southern hemisphere, but more severe, since aphelion nearly coincides with their winter solstice, and perihelion with our winter solstice.
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The Earth is flat. It is the rim of a disc, a curved line that arcs back upon itself. If I had time to explain it, you would still need time to understand it.