The solstice are related to Earths tilt on its axis

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The summer solstice happens when the north pole is tilted toward the sun and the line from the sun to the earth center hits the tropic of Cancer, about 23 deg north of the equator. That is summer solstice here in the north, in June
When the sun is at the opposite side of the orbit, the South pole is tilted toward the sun and the line hits the tropic of Capricorn, about 23 degrees south of the equator. That is winter solstice here in the north, in December.