The most surreal part of implementing the new calendar came in October 1582 , when 10 days were dropped from the calendar to bring the vernal equinox from March 11 back to March 21. The church had chosen October to avoid skipping any major Christian festivals. October 4th, 1582 was the last day of the Julian calendar . To sync to the Gregorian calendar , 10 days were skipped, making the next day October 15 The Julian calendar was proposed by Julius Caesar in 46 BC and was put into use on January 1, 45 BC. It was very close to the actual length of the year but was still found to drift, leaving almost a day in a period of 128 years, because it was 365.25 days long. By 1582 it had drifted a full 10 days from the actual date. Learn how the Gregorian calendar skipped 10 days in October 1582 to align with the solar year. Find out how to calculate the day of the week for any date using simple tricks and formulas. In 1582 , Pope Gregory XIII announced that a 10-day chunk of October would be struck from the calendar . Not everyone was willing to play along.

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