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  1. Feb 29, 2020 · Aloysius devised a system in which every fourth year was a leap year; however, century years that were divisible 400 were exempted. So, for example, the years 2000 and 1600 were leap years, but not...

    • Robert Coolman
  2. However, nearly every four years is a leap year, when one extra—or intercalary—day, is added on 29 February, making the leap year in the Gregorian calendar 366 days long. The days of the year in the Gregorian calendar are divided into 7-day weeks, and the weeks are numbered 1 to 52 or 53. The international standard is to start the week on Monday.

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  4. The leap year was created in ancient Rome, 46 B.C., when Julius Caesar decided that the length of the calendar year had to be both standardized and kept in line with the actual solar year. Before Caesar established the Julian Calendar, the Roman year was 355 days plus an extra 27 or 28-day month every other year, for an average year of 366.25 days.

  5. There were two reasons to establish the Gregorian calendar. First, the Julian calendar assumed incorrectly that the average solar year is exactly 365.25 days long, an overestimate of a little under one day per century, and thus has a leap year every four years without exception.

  6. The solar year is about 11 minutes less than 365¼ days in length. Therefore, to compensate the discrepancy, the extra day or leap year is omitted three times every four hundred years. History of the Calendar The first calendar was devised in 735 BCE by Romulus, the first Roman king. This calendar had 10 months instead of the usual 12 months.

  7. A leap year is a date or day added by the Gregorian calendar to most years that are divisible by four. Leap years included years such as: 2008 2012 2016 2020 2024. February typically has 28 days. However, in leap years, February will have an extra day in the month. From 28 to 29.