In 1923, Milutin Milanković proposed to a synod of some Eastern Orthodox Churches at Constantinople that only those centennial years (those ending in 00) that leave a remainder of 200 or 600 upon division by 900 would be leap years, decreasing the average year length to 365.24 days. These remainders were chosen to delay as much as possible the first year (after 1923) that this calendar would disagree with the Gregorian calendar, until 2800. It was adopted by some Eastern Orthodox Churches under the names Revised Julian calendar or New calendar, but was rejected by others.