When have we LOST 10 Days? How does the Gregorian calendar work? | On This Day – 4th October |

Intro: In 1582 The Gregorian Calendar was introduced by Pope Gregory XIII.
The Julian calendar, that was used before the Gregorian one, miscalculated the length of the solar year by 11 minutes.
Ancient Egyptians are credited for first determining the real length of a solar year.
The original goal of the Gregorian calendar was to change the date of Easter, which was traditionally observed on March 21, but fell further away from the spring equinox with each passing year.



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