What is Time? Gregorian Calendar, These Fantastic Worlds
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What is Time? The Gregorian Calendar

From 1540, two major developments brought long-lasting change to our notions of time. The calendar reforms of Pope Gregory gave us the Gregorian calendar we have today, and the ultimate acceptance of the heliocentric system (that the earth circulated the sun, not the other way round) provided a victory for science over the Catholic Church. Copernicus' Radical Idea…