Torre dell'Orologio, Mantua

The Torre dell'Orologio is a 15th-century renaissance tower on the Piazza delle Erbe in Mantua, Italy.

It was once surrounded by 12 circular frescoes depicting the arts of the quadrivium: as the plasterwork has fallen away, only the four underneath the canopy are now visible.

Inside the zodiac, another overlaid disc, numbered up to 29 in threes, represents the date of the lunar month.

At the centre of the dial, the goddess Latona (mother of Apollo and Diana – the Sun and Moon)[2] sits with open arms, a deer at her feet.

Latona's right hand, holding a sickle in the shape of the crescent moon, indicates the date of the lunar month.

The clock's off-centre blue semicircle with thirty golden studs, fixed to the zodiac ring between Libra and Pisces, represents the celestial equator.