Pope Gregory XIII is widely known as the mastermind behind the Gregorian calendar reform which we use today. However, what many people don’t know is that the reform was sparked by an asteroid! In 1580, a new celestial object entered the night sky, which was visible to the naked eye. This object was later identified as an asteroid, and its discovery caused the Pope to call for a calendar reform. A papal bull was issued in 1582, introducing a new calendar system that was based on the motion of the asteroid. This calendar reform has had a lasting impact on our lives, as it is still used today.

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source: Phys.org