Portal:Astronomy/Picture/21 May 2005
From Infogalactic: the planetary knowledge core
The astrolabe was a navigational device in common use until the 16th Century, consisting of an engraved representation of the celestial sphere, and is a predecessor of the modern planisphere. This 18th Century Persian astrolabe is in the Whipple Museum of Science History in Cambridge. Photo: Andrew Dunn
