Yule or Yule-tide (“Yule-time”) is a winter festival that was initially celebrated by the historical Germanic people as a pagan religious festival, though it was later absorbed into, and equated with, the Christian festival of Christmas. The festival was originally celebrated from late December to early January on a date determined by the lunar Germanic calendar. The festival was placed on December 25 when the Christian calendar (Julian calendar) was adopted. Scholars have connected the celebration to the Wild Hunt.
Terms with an etymological equivalent to “Yule” are still used in the Nordic Countries for the Christian Christmas, but also for other religious holidays of the season. In modern times this has gradually led to a more secular tradition under the same name as Christmas. Yule is also used to a lesser extent in English-speaking countries to refer to Christmas. Customs such as the Yule log, Yule goat, Yule boar, Yule singing, and others stem from Yule. In modern times, Yule is observed as a cultural festival and also with religious rites by some Christians and by some Neopagans.
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Source: http://en.wikipedia.org/wiki/Yule