The Salisbury Cathedral clock is a historic astronomical clock located in Salisbury Cathedral, England. It was built around 1386, making it one of the oldest working clocks in the world. The clock features a unique mechanism that not only tells the time but also displays the phases of the moon and the position of the sun. This remarkable timepiece is notable for its intricate design and craftsmanship. The clock is driven by a weight and chain system, which requires regular winding. Visitors to Salisbury Cathedral can admire this medieval marvel, which reflects the advanced engineering skills of its time.