Christmas is the world's largest Christian festival. Is generally believed that December 25 as Christmas may begin in the year 336 AD, the Church of Rome. 4 of the century, January 6 is the Roman Empire, the eastern churches to commemorate the birth of Jesus and the baptism of the double holiday, that is God himself through Jesus Christ to the world. On this day the Roman calendar is the Winter Solstice Festival, the beginning of the recovery means everything. May be due to this reason, the Church of Rome before choosing this day as Christmas. Later, as used throughout the church calendar is different from the specific date can not be unified, so put December 24 to January 6 the following year as the Christmas holiday season (Christmas Tide), the local churches according to the specific local situation in within the period of this festival to celebrate Christmas. Many countries in Europe and America, people attach great importance to this festival, put it and New Year's together, but with a grand celebration of the excitement far beyond the New Year has become a national holiday. December 24 Christmas Eve, December 25 Christmas Day the main celebration with the legend of the birth of Jesus.