Summer solstice

Associated Press
Following an annual all-night party, people rest during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Thousands of New Agers and neo-pagans danced and whooped in delight at the ancient stone circle Stonehenge, marking the summer solstice, the longest day of the year. (AP Photo/Lefteris Pitarakis)

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The summer season for Earth's Northern Hemisphere officially began on June 21. In England, more than 20,000 celebrants gathered at the famed Stonehenge monument to mark the day.

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