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