The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).
Jan 26, 2024 · Julian calendar, dating system established by Julius Caesar as a reform of the Roman republican calendar. By the 40s bce the Roman civic calendar was three months ahead of the solar calendar. Caesar, advised by the Alexandrian astronomer Sosigenes, introduced the Egyptian solar calendar, taking the length of the solar year as 365 1/4 days.
- The Editors of Encyclopaedia Britannica
The Julian calendar was a solar calendar based on Earth's revolutions around the Sun, introduced by Julius Caesar in 45 BCE and replaced the Roman calendar. It had 12 months, 365 days, and leap years every four years. It was replaced by the Gregorian calendar in 1582. Learn more about its history, accuracy, and usage in different cultures and religions.
- 11 min/year or1 day in 128 years
- Common year: 365Leap year: 366
- The Roman Empire and some Christian churches
The Julian calendar was replaced by the Gregorian calendar in 1582 because it did not correctly reflect the actual time it takes the Earth to circle once around the Sun. The switch took more than 300 years and varied by country, with some losing up to 13 days. Learn how to convert between the two calendars, the causes and effects of the calendar reform, and the cultural and historical variations.
Learn about the history, origins, and features of the Julian Calendar, a solar calendar based on the Earth's orbit around the Sun, established by Julius Caesar in 46 BC. Find out how it differs from the Gregorian Calendar and the Eastern Orthodox Church's calendar, and see some examples of its celebrations.
The Revised Julian Calendar is a more accurate calendar system than the Gregorian calendar, with an error of 2 seconds per year. It is used by some Orthodox churches and some other groups, but not by the civil population. Learn how it works, why it is not used by the civil population, and how it compares with other calendars.
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