June 21 is called the summer solstice in the Northern Hemisphere and simultaneously the winter solstice in the Southern Hemisphere. Around December 21 the solstices are reversed and winter begins in the northern hemisphere.
Solstice participants wait for the midsummer sun to rise over the megalithic monument of Stonehenge on June 21, on Salisbury Plain, England. Crowds gathered at the 5,000 year old stone circle to celebrate the Summer Solstice; the longest day of the year in the Northern Hemisphere.
