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AMESBURY, ENGLAND - DECEMBER 21:  A man takes a photograph of the sunrise as druids, pagans and revellers celebrate the winter solstice at Stonehenge on December 21, 2012 in Wiltshire, England. Predictions that the world will end today as it marks the end of a 5,125-year-long cycle in the ancient Maya calendar, encouraged a larger than normal crowd to gather at the famous historic stone circle to celebrate the sunrise closest to the Winter Solstice, the shortest day of the year.  (Photo by Matt Cardy/Getty Images)
AMESBURY, ENGLAND - DECEMBER 21:  A man takes a photograph of the sunrise as druids, pagans and revellers celebrate the winter solstice at Stonehenge on December 21, 2012 in Wiltshire, England. Predictions that the world will end today as it marks the end of a 5,125-year-long cycle in the ancient Maya calendar, encouraged a larger than normal crowd to gather at the famous historic stone circle to celebrate the sunrise closest to the Winter Solstice, the shortest day of the year.  (Photo by Matt Cardy/Getty Images)

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What you need to know about the winter solstice

CNN's Jennifer Gray breaks down what the winter solstice is and how it's different from the equinox.

What you need to know about the winter solstice

CNN's Jennifer Gray breaks down what the winter solstice is and how it's different from the equinox.