The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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The Queen's Christmas speech was first televised in 1957.
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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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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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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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7.6 million Christmas trees are sold each year.
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