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Early morning mist lingers in fields as the autumn sun rises over the Somerset Levels as viewed from Glastonbury Tor near Glastonbury on September 22, 2017 in Somerset, England. Today marks the start of the astronomical autumn, which is defined by the Earth's axis and orbit around the sun. The transition from summer to autumn is defined by the autumn equinox, when day and night are of roughly equal length, but also signals that the nights will become increasingly longer than the days until the spring equinox, when the pattern is reversed. (Photo by Matt Cardy/Getty Images)
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