TIL that in October 1582, because of the transition from Julian Calendar to Gregorian Calendar, 10 days were skipped to bring the vernal equinox from March 11 back to March 21. October was chosen to avoid skipping any major Christian festivals. That year, October 4th was followed by October 15th.

Read more: https://www.britannica.com/story/ten-days-that-vanished-the-switch-to-the-gregorian-calendar

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  1. The change in 1582 was only in certain Catholic countries. Great Britain and the empire did not switch until 1752. Turkey didn’t officially change until 1926. Saudi Arabia in 2016.

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