The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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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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At Christmas, it is traditional to exchange kisses beneath the mistletoe tree. In ancient Scandinavia, mistletoe was associated with peace and friendship. That may account for the custom of "kissing beneath the mistletoe".
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English Puritan leader Oliver Cromwell banned Christmas between 1647 and 1660 because he believed such celebrations were immoral for the holiest day of the year.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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There are 13 Santas in Iceland, each leaving a gift for children. They come down from the mountain one by one, starting on December 12 and have names like Spoon Licker, Door Sniffer and Meat Hook.
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The Queen's Christmas speech was first televised in 1957.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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