The Julian calendar takes effect for the first time on New Year's Day In 45 B.C., New Year's Day is celebrated on January 1 for the first time in history as the Julian calendar The Revised Julian calendar is one of the most accurate calendar systems ever developed. It reflects the length of the tropical year —the time Earth takes to complete a full orbit around the Sun-with an error of only 2 seconds per year. Other calendar systems are much less accurate. Julius Caesar thought it would be appropriate for January, Janus's namesake month, to be the doorway to a new year, and when he created the Julian calendar, he made January 1 the first day of 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 .

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