Following 20 years of research and consultation, Pope Gregory XIII signed a papal bull in February 1582, ordering that the new calendar would be brought into effect on October 5 of that year.

In 1582, Pope Gregory XIII introduced the Gregorian calendar. Prior to this, most of the Roman world and Europe had used the Julian calendar, introduced by Julius Caesar in 45 BCE.

"Calendar glitch hai," the third user commented on Instagram. "By 1582, the Julian calendar, with a Leap Day every four years, had accumulated TEN extra days relative to Earth's orbit.

In 1582 it corrected the Julian calendar, shortening the average year by 0.0075 days to stop the drift with respect to the equinoxes. In 1582, Thursday, October 4 was followed by Friday, October 15.

This new calendar, the Gregorian calendar, jumped from October 4, 1582, to October 15, 1582. It also made a better approximation of the natural length of the year by manipulating leap years over a ...

Today is the 434th anniversary of the introduction of the Gregorian calendar, as a subtle new Google Doodle reminds us. Back in 1582, Pope Gregory XIII decreed that the 10 days following October 4 ...

But, although the Gregorian calendar—named for the Pope who developed it—was first introduced in 1582, England and its colonies didn’t adopt the new calendar until 1752. By that point, the ...

More than 2,000 years ago, Romans tried to fix the calendar, ... After skipping 10 days in October 1582 to "catch up," it has changed little since then. What to know about February and leap year.

Following 20 years of research and consultation, Pope Gregory XIII signed a papal bull in February 1582, ordering that the new calendar would be brought into effect on October 5 of that year.