Astrolabes were early scientific instruments that can be traced back to the 6th century AD. They were used for reckoning time as well as astronomical exploration, navigation and astrology. In medieval Europe, astrolabes were widely used for astrological purposes. By the mid-15th century, sailors adopted the device to navigate at sea. It enabled the determination of the position of the sun and prominent stars in relation to both the horizon and the meridian. Astrolabes represent a unique blend of science and myth that reveals the logic of an earlier time, when humans were still trying to make sense of the natural world. Made of 2 oz of. Very limited mintage of 1500 available worldwide. The obverse side of the coin has several historical instruments and a small effigy of Queen Elizabeth II. The reverse side has a replica of the astrolabe. Stands in images are not included. If you have any questions, don´t hesitate, just ask. All items are 100% authentic, in Perfect Condition. I post high resolution photos, but you can ask more (photos) in case you notice something. If you face any problem, p. Lease use Add to Cart and in the end Request Total. Feel free to contact me if you have any questions. Once receiving feedback, I will post a positive one for you also. I ALWAYS try to solve any problems.