This clock represents the pinnacle of achievement in horology for the late 17C. How Thomas Tompion who made it acquired his outstanding scientific and technical skills is not known. The 'face' has ...

The astrolabe was in use until the last half of the 17th century. The invention of the pendulum clock made clocks much more reliable, and more specialized and accurate scientific devices ...

Al-Khujandi’s astrolabe is essentially a clock, notes Prof. Hogendijk, with a 24-hour dial, using the sun instead of the modern hand. “The sun shows the time as the hand in the modern clock.

While it’s nowhere near as complicated an instrument, this astrolabe puts us in the mood to watch the entire Clickspring clock build again. And [Chris] is working on his own ancient instrument ...

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.

The astrolabe was a mathematical instrument which was used to carry out astronomical measurements, to calculate the positions of the sun and the stars, and to tell the time. This one was made in ...