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Planisphere
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In astronomy, a planisphere is a star chart analog computing instrument in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time
Philips' Planisphere, ca. 1900
Philips' Planisphere, ca. 1900
Astrolabe
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An astrolabe is an astronomical instrument dating to ancient times. It serves as a star chart and physical model of the visible half-dome of the sky. Its various functions also make it an elaborate in
Planisphere
…the visible stars for any time and date for a given latitude. It is an instrument to assist in learning how to recognize stars and constellations. The astrolabe, an instrument that has its origins in Hellenistic astronomy, is a predecessor of the modern planisphere. The term planisphere contrasts with armillary…
North African, 9th century ce, planispheric astrolabe. Khalili Collection.
North African, 9th century ce, planispheric astrolabe. Khalili Collection.
A modern astrolabe made in 2013, in Tabriz, Iran.
A modern astrolabe made in 2013, in Tabriz, Iran.
16th-century woodcut of the measurement of a building's height with an astrolabe
16th-century woodcut of the measurement of a building's height with an astrolabe
A modern reconstruction of the spherical astrolabe of Ptolemy, 2nd C.E., in Kotsanas Museum of Ancient Greek Technology, Athens.
A modern reconstruction of the spherical astrolabe of Ptolemy, 2nd C.E., in Kotsanas Museum of Ancient Greek Technology, Athens.