The RIM of the MATER of this brass astrolabe bears a 360° scale numbered by 10° clockwise starting underneath the throne. The rim is rivetted to the backplate. The inside of the rim has a recess at 12 o'clock underneath the throne to accommodate the tongues of the plates. The inside of the mater bears markings for a plate... Italy, late 15th century, Diam: 14.7cm.
Astrolabe, Italian, late 15th century. Mater, rete for about 36 stars, rule. On the reverse is a disc with 8 pointers for the aspects surmounted by 7 discs with pointers for the 5 planets, sun and moon, and a double pointer for the lunar nodes. Museum of the History of Science, Oxford.
This artifact is an Astrolabe from the 15th-18th century CE and was made in England. This item is made with brass. This artifact fits into my theme in that the constant advances in technology, this artifact was used to help navigate through the position of the sun and stars.