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Planispheric astrolabe, c 1570.

Planispheric astrolabe, c 1570.
4 0 c m
actual image size: 25cm x 32cm


This gilded bras astrolabe was made by Gualterus (Walter) Arsenius, an instrument maker from Louvain, Belgium. An astrolabe is in esence a model of the universe that an astronomer could hold in their hands. From its origins in the Ancient World, Islamic astronomers developed the astrolabe and its use spread. Popular in Medieval and Renaisance Europe, its many uses included timekeeping, astrology and surveying. The two-dimensional depiction of the heavens used on this instrument is achieved using universal projection rather than the stereographic technique more usually found on astrolabes. This front view shows the moveable fretwork plate called the 'rete', which denotes the positions of the stars by short curved pointers.

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© Science Museum / Science & Society Picture Library

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