The summer solstice occurs when the sun is the farthest north in the sky

The summer solstice occurs when the sun is the farthest north in the sky, directly above the Tropic of Cancer. In the Southern Hemisphere, today actually marks the 2011 winter solstice. These seasons will again be flipped between the hemispheres on December 22, when the second solstice of the year occurs (winter for Northern Hemisphere, and summer for Southern Hemisphere).

The Northern Hemisphere celebrates in June, but the people on the Southern half of the earth have their longest summer day in December.

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