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The planispheric astrolabe

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Published by National Maritime Museum in Greenwich [Eng.] .
Written in English


  • Astrolabes.

Book details:

Edition Notes

StatementThe Department of Navigation and Astronomy, National Maritime Museum, Greenwich.
The Physical Object
Pagination56 p. :
Number of Pages56
ID Numbers
Open LibraryOL19578194M
ISBN 100950176457

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astrolabe, the time is hence derived. Most astrolabes not only have the ecliptic, they also include the stars. The planispheric astrolabe, described here, uses a "projection" of the earth and the celestial sphere to the equator. Another variant uses the Saphea projection onto a vertical plane. The mariner's astrolabe, also called sea astrolabe, was an inclinometer used to determine the latitude of a ship at sea by measuring the sun's noon altitude (declination) or the meridian altitude of a star of known declination. Not an astrolabe proper, the mariner's astrolabe was rather a graduated circle with an alidade used to measure vertical angles.. They were designed to allow for their. The first printed book on the astrolabe was Composition and Use of Astrolabe by Christian of Prachatice, also using Messahalla, but relatively original. In , the first Indian treatise on the astrolabe was written by the Jain astronomer Mahendra Suri. Dec 24,  · This book is THE astrolabe book. It's a modern treatment that includes computer code as well as ancient methods for laying out astrolabes. It includes all kinds of variations, including a "linear astrolabe" that consists of a marked stick and three strings, which the Arabs used about years ago/5(33).

The planispheric astrolabe is a powerful astronomical calculator with a very clever design. It is composed of several fix or mobile disks, rulers and has fine scales engraved on both sides. Components of a planispheric astrolabe. Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. The planispheric astrolabe is what we simply call the astrolabe. Approximately one thousand astrolabes have survived time. Most of them are Islamic astrolabes and instruments from Christian Europe. In Europe astrolabes were used from the 11th century onwards, as the astrolabe was introduced via Islamic Al-Andalus to Latin Europe. The back of an astrolabe. The back is usually the same on a planispheric astrolabe and a universal astrolabe, either a Saphae Arzachelis or a Rojas astrolabe. The mariner's astrolabe does not have any back as it is pearced by large holes. And quadrant astrolabes show various drawings.

Jan 31,  · The Story of the Astrolabe, the Original Smartphone Prosperous times likely paved the way for this multifunctional device, conceptual ancestor to the iPhone 7Author: Laura Poppick. Mar 18,  · The Sodré astrolabe has made it into the Guinness Book of world records is believed to have been made between and and is unique in comparison to all other mariner's astrolabes. a version known as the planispheric astrolabe was in use. Star-finding with a planisphere The second half of the book concentrates on Hale-Bopp and contains interviews with the discoverers, details of observations made so far, planispheric charts, and general hints about observing prospects. The planispheric astrolabe is the most important and versatile instrument made in antiquity for the analogical performance of astronomical computations that would otherwise have been long and complex. Some scholars attribute its invention to Hipparchus of Nicaea (2nd C. B.C.E.), who was familiar with the stereographic projection used to construct it.