holidays
The Feast of the Conception of the Virgin Mary is a liturgical holiday celebrated on December 9 by the Orthodox Church and a number of Eastern Catholic Churches. It is also the name given in the Catholic Tridentine calendar for 8 December. In the present General Roman Calendar, the feast is called the Solemnity of the Immaculate Conception of the Blessed Virgin Mary. In the Eastern Orthodox Church, the holy day was once called the Feast of Conception of Saint Anne.
The Eastern Orthodox Church, officially the Orthodox Catholic Church, and also called the Greek Orthodox Church or simply the Orthodox Church, is one of the three major doctrinal and jurisdictional groups of Christianity, with approximately 230 million baptised members. It operates as a communion of autocephalous churches, each governed by its bishops via local synods. The church has no central doctrinal or governmental authority analogous to the pope of the Catholic Church. Nevertheless, the Ecumenical Patriarch of Constantinople is recognised by them as primus inter pares, a title held by the patriarch of Rome prior to 1054. As one of the oldest surviving religious institutions in the world, the Eastern Orthodox Church has played an especially prominent role in the history and culture of Eastern and Southeastern Europe. Since 2018, there has been an ongoing schism between Constantinople and Moscow, with the two not in full communion with each other.