How is the Revised Julian calendar related to the Gregorian calendar?

The Revised Julian calendar is a modern chronological system that closely resembles the Gregorian calendar. It was introduced in 1923 for use by some Eastern Orthodox churches to determine fixed liturgical dates.1

While the Gregorian calendar was established in 1582 to correct the drift of the Julian calendar by adjusting the leap year rule—specifically by dropping three leap years every 400 years—the Revised Julian calendar provides a similarly high level of accuracy in its alignment with the solar year. Because of their shared goal of correcting the inaccuracies of the original Julian system, the Revised Julian and Gregorian calendars are currently in sync, meaning they share the same dates for most of the year.123