Calling the 9th month “september” is technical debt
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Can someone write an RFC to migrate to something sensible? This explanation seems to track with wikipedia and other sources: youtu.be/Y9iOt48bTw4?...
That said, @bretdevereaux.bsky.social explained on the other site that this isn't quite right — it's not that Julius & Augustus added months, they just renamed Quintilis and Sextilis. The numbering's messed up because the Romans moved the new year from March to January (for a very silly reason).
The Roman ruler Numa Pompilius is credited with adding January at the beginning and February at the end of the calendar to create the 12-month year. In 452 BC, February was moved between January and March. www.britannica.com/science/Roma...