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The Orthodox calendar, also known as the Eastern Orthodox calendar or the Julian calendar, is a liturgical calendar used by the Eastern Orthodox Church and some other Eastern Christian churches. It is based on the Julian calendar, which was introduced by Julius Caesar in 46 BC. The Orthodox calendar is 13 days behind the Gregorian calendar, which is the most widely used calendar in the world today.

The Orthodox calendar was adopted by the Eastern Orthodox Church in the 4th century AD. At that time, the Julian calendar was the most accurate calendar in use. However, over time, the Julian calendar began to drift away from the true solar year. In 1582, Pope Gregory XIII introduced the Gregorian calendar, which was a more accurate calendar than the Julian calendar. The Gregorian calendar was adopted by most Western Christian churches, but the Eastern Orthodox Church did not adopt it.

The main difference between the Orthodox calendar and the Gregorian calendar is the way that they calculate the date of Easter. Easter is the most important feast day in the Orthodox Christian year, and it is always celebrated on the first Sunday after the first full moon after the spring equinox. The spring equinox is the day when the length of day and night is equal.
In the Gregorian calendar, the spring equinox always falls on March 21st. However, in the Orthodox calendar, the spring equinox can fall on any day between March 21st and April 25th. This is because the Orthodox calendar uses the Julian calendar, which is 13 days behind the Gregorian calendar.

The Orthodox calendar is a complex and fascinating calendar. It is a reflection of the rich history and traditions of the Eastern Orthodox Church. The Orthodox calendar is used by millions of Christians around the world, and it is an important part of their religious life.





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