Скачать или смотреть The Calendar Change That Suddenly Erased 11 Days From History

Discover the calendar change that suddenly erased 11 days from history in this intriguing video about historical events. Explore the impact of this change on society and learn more about the fascinating history behind it.

On February 24, 1582, Pope Gregory XIII issued the papal bull "Inter gravissimas", which introduced the Gregorian calendar, the calendar system that is still in use across much of the world today. This reform replaced the Julian calendar, which had been in use since 46 BCE, to correct inaccuracies in the calculation of the solar year.

Why Was the Calendar Reformed?
The Julian calendar, introduced by Julius Caesar, had a slight flaw: it assumed the solar year (the time it takes for Earth to orbit the sun) was 365.25 days, when in fact, it is approximately 365.2422 days. Over centuries, this discrepancy caused the calendar to drift about 11 minutes per year, accumulating to about 10 days by the 16th century.

This drift affected the timing of key religious observances, such as Easter, which is calculated based on the spring equinox. By the 1500s, the equinox no longer aligned with its intended date, creating a need for correction.

The Gregorian Reform
Pope Gregory XIII convened experts, including astronomer and physician Aloysius Lilius and Jesuit mathematician Christopher Clavius, to design a new calendar. The Gregorian calendar introduced several changes:

Leap Year Adjustment: To better approximate the solar year, a leap year was kept every four years, except for years divisible by 100 but not divisible by 400. For example, 1600 was a leap year, but 1700, 1800, and 1900 were not.
Date Adjustment: Ten days were removed from the calendar in October 1582, with the day after October 4 becoming October 15 to realign the calendar with the equinox.
Easter Reform: The calculation for Easter was modified to ensure it aligned more closely with the equinox.
Adoption of the Gregorian Calendar
The calendar reform was initially adopted by Catholic countries, such as Italy, Spain, Portugal, and France, in 1582. Protestant and Orthodox countries were slower to adopt it due to religious and political differences. For example:

England and its colonies switched in 1752, skipping 11 days.
Russia adopted the Gregorian calendar after the Bolshevik Revolution in 1918.
Greece was one of the last European nations to adopt it in 1923.
The Legacy of the Gregorian Calendar
The Gregorian calendar remains the international standard for civil use. Its implementation not only resolved inaccuracies in timekeeping but also highlighted the growing importance of science and astronomy in shaping societal norms. The reform is a testament to the intersection of religion, science, and global cooperation.

In 1582, a major calendar reform transformed how we track time when the flawed Julian calendar explained system needed updating. The story centres around October 4 1582, when ten days mysteriously vanished as part of Gregorian calendar history implementation. This fascinating piece of timekeeping history showcases how calendar adoption spread gradually across different nations, leading to some interesting date-keeping confusion along the way. 🗓️

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