Why do we need leap years?

Fun leap year trivia I did NOT know:  because of the definition regarding leap years, the years 1700, 1800, and 1900 were NOT leap years.  2100 won’t be a leap year, either.  Read to find out why:

In 1582, Pope Gregory XIII revised the Julian calendar by creating the Gregorian calendar with the assistance of Christopher Clavius, a German mathematician and astronomer. The Gregorian calendar further stated that leap days should not be added in years ending in “00” unless that year is also divisible by 400. This additional correction was added to stabilize the calendar over a period of thousands of years and was necessary because solar years are actually slightly less than 365.25 days. In fact, a solar year occurs over a period of 365.2422 days.

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