Il Calendario Pasquale di Ravenna
In the Archiepiscopal Museum of Ravenna, a marble slab of about 90 cm per side dating from the VI century is exposed, at least from the early 1950s. It shows a circular graph divided into 19 segments, similar to the section of a citrus fruit or the crown of petals of a daisy. This is the oldest representation of the Easter cycle calculated by the abbot Dionigi, called 'the Little', around the year Domini 525. Easter, for Christians, is certainly the most important feast of all those of the liturgical calendar. In Easter the whole Christian mystery (passion, death and resurrection of Jesus) is contained, which is remembered daily in the celebration of the Eucharist. It is a mobile party, which is not repeated every year on the same date. The importance of a precise calculation was fundamental for the Catholic Church, and the marble table of Ravenna is its most ancient demonstration.