About
Hidden in a tiny Baroque chapel is a landmark in the history of technology and computing.
On 1832, world-famous Italian astronomer and mathematician Giovanni Antonio Amedeo Plana published his book theorizing the motions of the Moon, which led him to develop his Perpetual Calendar: an amazing mechanical device that allows anyone to easily discover details about any date between years 1 and 4000. Plana's Perpetual Calendar is discreetly hanging on the sacristy of the Chapel of Merchants and Bankers in Turin, Italy. It operates by turning a wooden handle below the calendar’s adorned golden frame.
