New year's day. There is a history of which changes according to the era, as appropriate. From the beginning, when the people of BA Bich Lo in Virginia. To start the calendar invented the phase of the moon as a principle in the count. When the full 12 months, 1 year, and to determine whether this is a fit during a calendar year to count years, seasonal, so add 1 month to month 13 months every 4 years.
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