In the beginning, when the people of BA in business logistics start invented calendar. Based on the different stages 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.When you add in February has 29 days in every four years, but it's not on the calendar to match a season traveler. Is the time in your calendar is longer than a year, according to the season. As a result, the season prior to the arrival date in the calendar.But in 1582 (equivalent to b.e. 2125) wasan twi back su history occurred on March 11 instead of the March 21. Pope Gregory the 13th, so make adjustments to fix broken days out of 10 days from the calendar year, and the day after October 4, 1582 October 5, rather than the change to October 15 (years), a new calendar, the Gregorian calendar is called the update announcement January 1 as the beginning of the year.
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