This clock in the north transept of Wells Cathedral is believed to be the 2nd oldest working clock in the world and the oldest clock with a working dial. It was made in ~1390 when it was believed that the earth was the centre of the universe and it has an astronomical clock face with the earth at its centre. The knights above the clock come out and joust every quarter hour with one knight getting knocked off his horse every time... for over 600 years!!
