Opuscula Iuventutis Mathematica Curiosa...
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Location: Dibner Library of the History of Science and Technology
Dan. Erasmi ab Huldeberg Sac. Rom. Imp. Equitis Opuscula iuuentutis mathematica curiosa : quorum syllabum pagina versa exhibet in vnum collecta et tertium edita
The first part of this work describes a newly invented instrument of the era: a planisphere illustrated with a plate. 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 and date. It is an instrument to assist in learning how to recognize stars and constellations. The astrolabe, an instrument that has its origins in the Hellenistic civilization, is a predecessor of the modern planisphere.
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