Messina astronomical clock

The side of the campanile facing the square has the following displays, described from bottom to top:

• The carousel of the days of the week. Each day is represented by its classical deity, in a chariot pulled by an animal:[2]
  • Sunday: Apollo, driving a horse
  • Monday: Diana, driving a deer
  • Tuesday: Mars, driving a horse
  • Wednesday: Mercury, driving a panther
  • Thursday: Jupiter, driving a chimera
  • Friday: Venus, driving a dove
  • Saturday: Saturn, driving a chimera
• The carousel of the ages of life. Four statues represent the ages of man: a child, a young man, a warrior, and an old man. Each succeeds the last every quarter hour, passing in front of the skeletal figure of Death, who waves a scythe.[3]
• The Sanctuary of the Madonna at Montalto. Representing the sanctuary's foundation in the 13th century, a dove flies in a circle and the sanctuary rises from the ground at midday.[4]
• Biblical scenes. A different biblical scene appears in each quarter of the liturgical year:[5]
  • Christmas to Epiphany: the Adoration of the Shepherds. The shepherds pass and bow before Joseph, Mary and the infant Jesus.
  • Epiphany to Easter: the Adoration of the Three Kings. Led by a comet, the kings, each accompanied by a servant, adore the infant Jesus, held by Mary.
  • Easter to Pentecost: the Resurrection of Jesus. Two soldiers keep watch over Jesus' tomb, from which Jesus rises.
  • Pentecost to Christmas: the Descent of the Holy Spirit. The twelve apostles surround the Virgin Mary. A dove, symbol of the Holy Spirit, flies over the apostles; flames appears on their heads, while they raise their arms.

Dina and Clarenza with the rooster, above Madonna of the Letter

• The Madonna of the Letter, patron saint of Messina. According to legend, Messina's ambassadors were sent to Jerusalem to pay their respects to the Virgin Mary, and received a letter from her, granting the city her benediction. At midday, an angel hands the letter to the Madonna. St. Paul and the ambassadors pass in front of the Madonna and bow their heads.[6]
• Dina and Clarenza. According to legend, Dina repelled an attack on Messina by rolling rocks while Clarenza rang the bells of the campanile to alert the city, during the Sicilian Vespers in 1282. They ring the quarter hour bells. Between them, at midday, the rooster flaps its wings, raises its head and crows three times.[7]
• At the top, the crowned lion (symbol of the Province of Messina) carries the flag of Messina. At midday, it waves the flag, moves its tail, turns its head and roars three times.[8]

The side of the campanile facing the cathedral has two dials, plus the moon phase:

• The lower dial is the perpetual calendar. The outer ring rotates annually to indicate the day and month. Moving panels on the ring indicate moveable feasts. A marble angel points an arrow to indicate the day.[9] The year is shown numerically in an aperture.
• The upper dial is the planetarium. It shows the orbit of the nine planets of the Solar System around the Sun, at the dial's centre, moving through the signs of the Zodiac. The planets are positioned proportionally to their true distance from the Sun.[10]

Above the dials, the Moon is represented by a half-gold, half-black rotating sphere, 1.2m in diameter, which indicates the lunar phase.[11]