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Exactly 435 years ago (on Oct. 4) 10 days vanished

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and Oct. 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 of  1582

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Disappeared.

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For more use the DOOR.

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October 1582
Sun Mon Tue Wed Thur Fri Sat
1 2 3 4 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31

 

   Creation of the Gregorian Calendar

   In the 16th century, most of Europe was using the Julian calendar, created in the first century B.C. The Julian calendar operated on a four-year-cycle, with 365 days in the standard year and a 366-day year every fourth year.

The 365 1/4-day year came very close to approximating the solar year. the length of time it takes for the Earth to revolve completely around the sun (about 365.2424 days, according to The Galileo Project). However, over the span of centuries, the difference (about 11 minutes, 14 seconds) added up, and the calendar began to become noticeably inaccurate.

The vernal equinox, which typically occurs on March 20, was occurring about 10 days later on the calendar. This had particular significance for the Catholic Church, which celebrated Easter on the first full moon after the equinox (fixed by the church at March 21), and set other religious dates depending on the date of Easter. “An error in the equinox thus introduced numerous errors in the entire religious calendar,” explains The Galileo Project.

[Adapted from Wikipedia]