Is Leap Year every 4 Years? No.

Most of us think Leap Year occurs every four year - that's not correct - in the Julian Calendar used prior to 1582, that was the case, but that was an inaccurate system that led to our calendar getting so far out of sync with the tropical year that when the calendar was reinvented and the Gregorian calendar was first adopted in Italy, Poland, Portugal and Spain in 1582, 10 days had to be removed to get us back to where we should be and calculation of leap years included the following changes:

  • Formula for calculating leap years:
    1. The year is evenly divisible by 4;
    2. If the year can be evenly divided by 100, it is NOT a leap year, unless;
    3. The year is also evenly divisible by 400: Then it is a leap year

Make sense? A little complex, but not as confusing as the more accurate Mayan calendar, and it keeps us better in tune with the sun.


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