In the Catholic Church, the altar is the structure upon which the Eucharist is celebrated. The altar, centrally located in the sanctuary, is to be the focus of attention in the church. At the beginning of the Roman Rite of Mass, the priest first of all reverences the altar with a kiss and only after that goes to the chair at which he presides over the Introductory Rites and the Liturgy of the Word. Except in Solemn Mass, a priest celebrating Tridentine Mass (use of the 1962 version of which is by the 7 July 2007 motu proprio Summorum Pontificum still authorized for use both privately and, under certain conditions, publicly) remains at the altar the whole time after saying the Prayers at the Foot of the Altar.