The Byzantine Rite Orthodox likewise celebrate the Nativity of the Theotokos on 8 September. The Syriac Orthodox Church, like its closely related sister church, the Byzantine Rite Antiochian Orthodox Church, also celebrates the feast on 8 September. For churches using the old Julian Calendar for liturgical purposes September 8 falls on September 21 of the Gregorian Calendar. In other words, "Old Calendar" Churches, such as the Russian Orthodox Church, still celebrate the Nativity of the Theotokos on the 8th, but the day is actually the 21st according to the everyday calendar used by society at large.