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A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera. De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c ...
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Santucci's armillary sphere is a Ptolemaic armillary sphere at the Museo Galileo in Florence, the largest existing in the world. [ 1 ] Begun on March 4, 1588, and completed on May 6, 1593, this large armillary sphere was built under the supervision of Antonio Santucci at the request of Ferdinand I de' Medici .
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...
Armillary sphere: model of objects in the sky consisting of a framework of rings; Astrarium: timepiece and astronomical prediction device; Astrolabe: astronomical instrument; Astronomical clock: clock with special mechanisms and dials to display astronomical information; Antikythera mechanism: ancient Greek analogue astronomical computer
An armillary sphere in a painting by Sandro Botticelli, c. 1480. Historian Oscar G. Darlington asserts that Gerbert's division by 60 degrees instead of 360 allowed the lateral lines of his sphere to equal to six degrees. [23] By this account, the polar circle on Gerbert's sphere was located at 54 degrees, several degrees off from the actual 66 ...
In the files of the Woodrow Wilson Foundation, the following brief description was found: "A complex silence and solitude reigned; the great ceremony of dedication, with the 30th Assembly in session, had become impossible: only an occasional chance visitor and a few especially interested Americans watched the Italians putting the great sphere ...
The Jagiellonian globe, also known as the Globus Jagellonicus, is a mechanical armillary sphere made in France before 1510. It is an astronomical instrument and a universal clock tracking both local solar time and sidereal time. The central brass sphere is engraved with a map of Earth and contains the clock mechanism.