Every 22 years.
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The sun's pole reversal is tied to the sunspot cycle.
the sun
When the South Pole is tilted away from the sun, it is winter in the Southern Hemisphere.
they are either having the rays of the sun hitting the pole all day because of its tilt, it is always facing the sun. Or, because of the tilt, the pole is always facing away from the sun and its rays
North and south pole