Relating to Pope Gregory I or the calendar system he helped establish, used in most of the world today.
Named after Pope Gregory XIII, who in 1582 reformed the Julian calendar to better match Earth's actual orbit. The 'Gregorian calendar' replaced its predecessor to correct the drift that had accumulated over centuries.
The Gregorian calendar was so mathematically clever that it won't need correction for another 3,000 years—Pope Gregory's team of astronomers figured out we needed to skip leap years on century years unless divisible by 400. This one reform affected how literally every civilization on Earth measures time today.
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