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The ancient Romans used to use a calendar of 10 months that were 30 or 31 days long, and just a pile of winter days at the end of the year, the exact amount decided by Consul. Julius Caesar thought this was stupid, so he introduced a 12 month calendar, with a leap day every 4 years years. We still use this basic calendar albeit with some minor modifications (Pope Gregory had a team figure out that skipping the leap year every 100 years, except if it is every 400 years, would be more accurate). Of course, he decided to shove the extra two months in the middles (July & August, named after himself & Augustus Caesar), which is why SEPTember, OCTober, NOVember, DECember are not the 7th, 8th, 9th, and 10th months you would expect from their names.