The Julian Calendar was off by 11 minutes every solar year, which added up and made us lose 10 days by the year 1582. The Gregorian Calendar is much more accurate and is only off by 26 seconds every solar year, which will eventually add up to make us lose 1 day by the year 4909. 5 February: Chinese New Year. This year marks the Year of the Pig. 21 March: Norwruz - also known as Iranian New Year. Celebrated for more than 3,000 years and considered a holy day by those who The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days. There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception. The Julian year is, therefore, on average 365.25 days long. Most New Year's festivities begin on December 31 (New Year's Eve), the last day of the Gregorian calendar, and continue into the early hours of January 1 (New Year's Day). The new calendar was based on the same principles as the Julian calendar, but with a few key changes. The most significant change was the introduction of a new rule for leap years. In the Gregorian calendar, a leap year is still added every four years, but years that are divisible by 100 are not leap years unless they are also divisible by 400. Vay Nhanh Fast Money.

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