New Julian and Gregorian calendar: what are the similarities and differences? 05.12.2023. On September 1, 2023, the Orthodox Church of Ukraine and the Ukrainian Greek Catholic Church will switch to the New Julian calendar. At first, it may seem that this is a regular Gregorian calendar, which in our era is 13 days ahead of the "old" Julian Orthodox Christmas is celebrated on January 7. Orthodox New Year, also known as Old New Year, is celebrated on January 14. Orthodox Easter is celebrated on May 2nd, 2021. Other Articles that may interest you: The Jewish Calendar The Islamic Calendar The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days. There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception. The Julian year is, therefore, on average 365.25 days long. The Revised Julian calendar, or less formally the new calendar and also known as the Milanković calendar, is a calendar proposed in 1923 by the Serbian scientist Milutin Milanković as a more accurate alternative to both Julian and Gregorian calendars. The 304-day calendar year began in March (Martius), named after the Roman god Mars. It continued until December, which was harvest time in temperate Rome. The Romans linked each year to the BtAZ.

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