Home » What Is Julian Calendar | History, Origin & Use

What Is Julian Calendar | History, Origin & Use

History Of Julian Calendar

The Julian calendar was the update or reform version of the old Roman calendar.


The Julian calendar was introduced in 46 BC by Julius Caesar.  


Julius Caesar found some calculation errors in the Roman calendar, that’s why he decided to make it correct. He Approached one of the famous Greek mathematicians and Alexandrian astronomer “Sosigenes” to design the Julian calendar. 

Replaced Old Roman Calendar

As we know that the Julian calendar came into existence in 46 BC because the old Roman calendar was very complicated and based on the Moon phases.

The most difficult task with the previous lunar calendar was that it required a group of people who decide when the day should be added or removed to Make the balance and synchronize the calendar and astronomical seasons. 

Julian Calendar As The First Solar Calendar

With the help of famous Greek mathematicians and Alexandrian astronomer “Sosigenes”, Julius Caesar created the world’s first Solar calendar and it was the standardized calendar of that time.

Julius Caesar did some changes in the old calendar and now the new calendar was based on Earth’s revolutions to the Sun.

Earth takes Approximately 365 days 5 hours 45 minutes and 45 seconds to complete one orbit around the sun. This duration is known as the tropical year. 

Replacement of Julian Calendar

By 1582, when the Gregorian calendar came into existence, most of the Roman and some other countries were using the Julian calendar, as it was the most appropriate calendar at the time. Pope Gregory XIII introduced the Gregorian calendar in 1582 and that changed the whole calendar world. 

Use Of The Julian Calendar 

The Julian calendar was used throughout the Roman Empire but currently, most of the countries are using the Gregorian calendar but some parts of the Eastern Orthodox Church and Oriental Orthodoxy are still using the Julian calendar.

These churches follow the Julian calendar to calculate the dates of moveable feasts. Apart from the orthodox churches, some people in North Africa known as Berber people and mount Athos also follow the Julian calendar.

See Calendar Printables for yourself.