However, the problem was n't completely solved by the Julian calendar, because a tropical year is n't # days long; it 's # days long. You still have a calendar drift problem, it just takes many centuries to become noticeable. And so, in #, Pope Gregory # instituted the Gregorian calendar, which was largely the same as the Julian Calendar, with one more trick added for leap years: even Century years (those ending with the digits #) are only leap years if they are divisible by #. So, the years #, #, and # were not leap years (though they would have been under the Julian Calendar), whereas the year # was a leap year. This change makes the average length of a year # days. So, there is still a tiny calendar drift, but it amounts to an error of only # days in # years. The Gregorian calendar is still used as a standard calendar throughout most of the world
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