Summer solstice

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.

Bubbles float past as revellers watch as the midsummer sun rises just after dawn over the megalithic monument of Stonehenge on June 21, 2010 on Salisbury Plain, England. Thousands of revellers gathered at the 5,000 year old stone circle to see the sunrise on the Summer Solstice, which is the longest day of the year in the Northern Hemisphere. (Photo by Matt Cardy/Getty Images)
Summer solstice
Bubbles float past as revellers watch as the midsummer sun rises just after dawn over the megalithic monument of Stonehenge on June 21, 2010 on Salisbury Plain, England. Thousands of revellers gathered at the 5,000 year old stone circle to see the sunrise on the Summer Solstice, which is the longest day of the year in the Northern Hemisphere. (Photo by Matt Cardy/Getty Images)
A woman is lifted above the crowd as revellers celebrate the Summer Solstice at Stonehenge on June 21, 2009 near Amesbury, England. Record crowds were expected to watch the sunrise over the ancient monument on the longest day of the year at 4.58am. Cloudy skies meant that the sun was not seen, but the event stayed dry unlike last year. Police had warned they would crack down on anti-social behaviour, treating the event as they would a Saturday night in a city centre. (Photo by Matt Cardy/Getty Images)
Summer solstice
A woman is lifted above the crowd as revellers celebrate the Summer Solstice at Stonehenge on June 21, 2009 near Amesbury, England. Record crowds were expected to watch the sunrise over the ancient monument on the longest day of the year at 4.58am. Cloudy skies meant that the sun was not seen, but the event stayed dry unlike last year. Police had warned they would crack down on anti-social behaviour, treating the event as they would a Saturday night in a city centre. (Photo by Matt Cardy/Getty Images)
Revellers dance in the centre of the stones as they wait for the arrival of the midsummer dawn at the megalithic monument of Stonehenge on June 20, 2013 near Amesbury, England. Despite cloudy skies, thousands of revellers gathered at the 5,000 year old stone circle in Wiltshire to see the sunrise on the Summer Solstice dawn. The solstice sunrise marks the longest day of the year in the Northern Hemisphere. (Photo by Matt Cardy/Getty Images)
Summer solstice
Revellers dance in the centre of the stones as they wait for the arrival of the midsummer dawn at the megalithic monument of Stonehenge on June 20, 2013 near Amesbury, England. Despite cloudy skies, thousands of revellers gathered at the 5,000 year old stone circle in Wiltshire to see the sunrise on the Summer Solstice dawn. The solstice sunrise marks the longest day of the year in the Northern Hemisphere. (Photo by Matt Cardy/Getty Images)
People raise their hands in celebration during the summer solstice shortly after 4:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People raise their hands in celebration during the summer solstice shortly after 4:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People raise their hands in celebration during the summer solstice shortly after 4:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
A woman hugs a stone pillar at the Stonehenge monument during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
A woman hugs a stone pillar at the Stonehenge monument during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
A woman hugs a stone pillar at the Stonehenge monument during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People gather during the summer solstice at Stonehenge, near Salisbury Thursday, June 21, 2012. Rain-sodden crowds welcomed a spectacularly rainy summer solstice at Stonehenge in true British fashion Thursday: With stoicism and wit. But through the wind and rain, drummers inside the ancient stone circle kept up their thumping rhythm, new age pagans kept up their chaotic dance, and visitors kept up their sense of humor. (AP Photo/Lefteris Pitarakis)
People take pictures during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People take pictures during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People take pictures during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People dance in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People dance in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People dance in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
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)
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)
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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
People perform in celebration during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
A man stands during the summer solstice shortly after 04:52 am at the prehistoric Stonehenge monument, near Salisbury, England, Friday, June 21, 2013. Following an annual all-night party, 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)
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)
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)
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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