The astrolabe was in use until the last half of the 17th century. The invention of the pendulum clock made clocks much more ...

Her giant astrolabe was bought in a gallery 11 years ago for 15,000 euros, and the astronomical clock turned artwork has auctioneer Simon stumped. Will any of the dealers have the right buyer in ...

Marine archaeologists say the object is an astrolabe, an instrument once used by mariners to measure the altitude of the Sun during their voyages. It is believed to date from between 1495 and 1500.