Hemisferium H86 Hanging Altitude Ring Dial
High solar clock. It is so named because the constructive parameter is based on the height of the sun. This brass ring is available in two versions: latitude 40º or 50º. In the fifteenth century the sailors found a way to estimate the Latitude to locate in the sea. They were based on a well-known fact: the altitude of the celestial bodies depends on the Latitude. Very soon other instruments joined the quadrant, the nautical astrolabe and the ballestilla. Pedro Nunes (Portugal) invented the nonius, a process of subdivision of scales and created other instruments of innovative design.

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