What was the Roman calendar reform under Julius Caesar?
Quick Answer
Julius Caesar reformed the Roman calendar in 45 BCE by creating the Julian calendar, a solar calendar with a leap day every four years. It replaced a lunar-based system that had become badly out of sync.
The Full Story
Before Julius Caesar’s reform, the Roman calendar had become increasingly misaligned with the seasons because of irregular adjustments. In 45 BCE, with the help of Egyptian astronomer Sosigenes, Caesar introduced the Julian calendar. It used a 365-day year with an extra day added every four years, bringing the calendar much closer to the solar year. The reform also rearranged month lengths and established January 1 as the beginning of the civil year. The Julian calendar remained in use for many centuries and influenced the modern Gregorian calendar.
Key Facts
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