Back on February 24, 1582, Pope Gregory XIII decided to shake things up. At the time, we were using the Julian Calendar, which had been around since 46 B.C. The problem? It didn’t quite match up with the solar year. Over centuries, this mismatch caused the dates to drift out of sync with the seasons.
To fix this, Pope Gregory XIII took advice from two top-notch astronomers and issued a papal edict. The big move? They decided to cut out 11 days from the calendar. So, in 1582, October 4th was immediately followed by October 15th. Just like that, 11 days vanished!
This new system was called the Gregorian Calendar. It also introduced the concept of leap year adding an extra day to February every four years. But there was a catch: centennial years wouldn’t be leap years unless they were divisible by 400. This tweak helps keep our calendar aligned with the Earth’s orbit.
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