88. Another most interesting contraption that really took off during the high middle ages was a device that could accurately predict the movement of the sun, moon, planets and stars. What was it called?
From Quiz Medieval History Innovations
Answer:
Spherical astrolabe
Various forms of this most amazing invention had been around since the 8th century BC, and were improved upon and developed further as the centuries passed. It enabled users to accurately predict the positions of all the heavenly bodies at any given point, proving an invaluable tool for seamen and astronomers in particular. Seamen though had to use a different form of this device, because the standard astrolabe was not really suitable in stormy weather. During western Europe's high middle ages, the spherical astrolabe came into being. Also known as the armillary sphere, this consisted of a round metal structure, with earth located at its centre, surrounded by various metal rings which represented longitude, latitude, different positions of the sun, planets and the months and days of the year and so on. By adjusting the axis of the astrolabe at any point, one was able to tell at a glance, from the earth's perspective, the positions of the sun, the stars and all the then known planets. At a later date, which made it even more accurate, the sun was placed at its centre instead of the earth.