The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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Robins on cards were a joke 150 years ago when postmen wore red tunics and were named after them.
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The poinsettia is a traditional Christmas flower. In Mexico (its original birthplace), the poinsettia is known as the "Flower of the Holy Night".
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The tradition of putting tangerines in stockings comes from 12th-century French nuns who left socks full of fruit, nuts and tangerines at the houses of the poor.
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7.6 million Christmas trees are sold each year.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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