It pushes back our knowledge about these important instruments by at least 30 years and it appears to be a transitional form from a planispheric
astrolabe to one used at sea.
A Latinized version of his planispheric
map was included in his Coelum Australe Stelliferum, published posthumously.
Modern day planispheric
astrolabe designed for the latitude of Varese (Italy), drawn by the Shadows Pro shareware.
Kim, director and CEO, Aga Khan Museum, Toronto Image Credit: A planispheric
astrolabe from Spain Image Credit: A carved marble capital from Spain Image Credit: Incised mother-of-pearl shell with inscriptions, from India Image Credit: A fritware, underglazed dish from Iran Image Credit: A porcelain ablution basin from Jingdezhen, China Image Credit: Carved ivory horn with silver mount from southern Italy Image Credit:
The emergence of the astrolabe as a single instrument began with the bringing together of two forerunners in Greece in the second century BC: the dioptra--an instrument for sighting the altitudes of celestial bodies--and planispheric
projections which could be used to represent the celestial sphere on a flat surface.
Almost every image in this sumptuously printed monograph includes a scientific instrument of some kind, including magnifying lenses, a military compass, sundials, prisms, and a planispheric
astrolabe from c.