Question: How was the Julian calendar created?
Answer: The Julian calendar was created in 46 BCE by Julius Caesar, who was advised by Alexandrian astronomer Sosigenes to reform the Roman republican calendar, which had drifted about three months ahead of the solar year. It adopted the Egyptian solar calendar, setting the year at 365.25 days with 12 months (30 or 31 days, except for February, with 28 or 29 days during leap years every fourth year). To align the calendars, Caesar lengthened the year 46 BCE to 445 days, and the system was fully stabilized by 8 CE.
