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this is how it works

A common year has 365 days. - A leap year has 366 days.

Every 4th year (that is a year which is divisible by 4) is a leap year.

Every 400 years, however, it is necessary to make corrections for
a little more than 3 days.

To compensate it was decided to make years ending in 00 common
years (365 days) with exception of centesimal years divisible
by 400. Those years will be considered leap years.

Thus the years 1700, 1800 and 1900 were common years,
whereas year 2000 will be a leap year.

the numbers of the calenders

1| 2| 3| 4| 5| 6| 7| 8| 9|10|11|12|13|14|

  1. common year starts on a Sunday
  2. common year starts on a Monday
  3. common year starts on a Tuesday
  4. common year starts on a Wednesday
  5. common year starts on a Thursday
  6. common year starts on a Friday
  7. common year starts on a Saturday
  8. leap year starts on a Sunday
  9. leap year starts on a Monday
  10. leap year starts on a Tuesday
  11. leap year starts on a Wednesday
  12. leap year starts on a Thursday
  13. leap year starts on a Friday
  14. leap year starts on a Saturday

The story behind

The Gregorian Calendar

The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and adopted by Pope Gregory XIII in accordance with instructions from the Council of Trent (1545-1563) to correct for errors in the older Julian Calendar. It was decreed by Pope Gregory XIII in a papal bull in February 1582.

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The story behind

The Julian Calendar

The Julian calendar was introduced by Julius Caesar in 45 BC. It was in common use until the 1500s, when countries started changing to the Gregorian Calendar. However, some countries (for example, Greece and Russia) used it into this century, and the Orthodox church in Russia still uses it, as do some other Orthodox churches.

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