Council of Florence
At the conclusion of the Council of Florence on June 6, 1439, the ceremony of union between the Catholic and Orthodox churches took place beneath the dome of Florence Cathedral. In the Old Sacristy of the Basilica of San Lorenzo in Florence, the smaller dome above the altar is decorated with astrological depictions of star constellations that have been calculated to represent July 6, 1439 at about noon, the date of the closing session of the Council of Florence, in which the Articles of Union between Eastern and Western Christendom were signed by Latin and Greek delegates.