Surveying: Did you mean...?

A European brass planispheric astrolabe, made in Italy c. 1500. The astrolabe was a device used to measure the position of stars, time, and as a surveying tool. (Science Museum, London)

A Persian planispheric astrolabe showing the various component parts, including multiple inserts (known as climates). Made by Jamal al-Din ibn Muquin, at Lahore, Pakistan, in 1077. Diameter: 25 cm. The astrolabe was a device...

Did you know that Roman roads were dug through mountains and across rivers? This video is all about Roman roads, how they were built, and how they lasted for centuries. Roman roads were, then, the...