Armillary sphere - Wikipedia
WEBAn 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 longitude and latitude and other astronomically important features, such as the ecliptic.
Armillary sphere | Navigation, Celestial, Celestial Sphere
WEBArmillary sphere, early astronomical device for representing the great circles of the heavens, including in the most elaborate instruments the horizon, meridian, Equator, tropics, polar circles, and an ecliptic hoop. The sphere is a skeleton celestial globe, with circles divided into degrees for.
The History of the Armillary Sphere - ThoughtCo
WEBFeb 22, 2019 · Armillary Spheres. Early tools used to study the sky and the celestial coordinate system. Leemage/UIG/Getty Images. By. Mary Bellis. Updated on February 22, 2019. An armillary sphere is a miniature representation of celestial objects in the sky, depicted as a series of rings centered around a globe. Armillary spheres have a long …
Armillary sphere | History of Science Museum
WEBInventory Number: 45453. Armillary spheres date back to the ancients, and were certainly used by the 2nd-century astronomer and mathematician Claudius Ptolemy of Alexandria. They were mathematical instruments designed to demonstrate the movement of the celestial sphere about a stationary Earth at its centre.
Armillary Sphere | Harvard Natural Sciences Lecture …
WEBArmillary Sphere. Model to show celestial sphere; larger version has capacity to show lunar motions. What it shows: The position and motions of heavenly bodies are projected against a hypothetical sphere of infinite radius, centered on …
Armillary Spheres: Following Celestial Objects in the Ancient …
WEBMay 30, 2019 · An armillary sphere is an astronomical device made up of a number of rings linked to a pole. These rings represent the circles of the celestial sphere, such as the equator, the ecliptic and the meridians. Incidentally, it is from these rings that the name of this device is derived from (the word armilla is Latin for “bracelet, armlet, arm ring”).
Armillary Spheres and Teaching Astronomy | Whipple Museum
WEBArmillary Spheres and Teaching Astronomy. Armillary spheres are models of the universe. They have been used since antiquity, but very few survive from before the 16th century. The Whipple Museum has one very early example, though dating it accurately is extremely difficult.
Armillary sphere | History of Science Museum
WEBThis large and impressive brass armillary sphere is both a working astronomical instrument and a decorative object of display, with a finely modelled sculptural base. It is constructed according to the ancient geocentric view of the Universe, as codified by Ptolemy in the second century CE.
Tycho Brahe and the Armillary Sphere - University of Cambridge
WEBThe equatorial armillary spheres were constructed to overcome the problem of the rings flexing or shifting under their own weight, and could be used to obtain the positions of stars in equatorial co-ordinates. Tycho had at least two of these instruments, which were composed of three or four rings.
Starry Messenger: The Armillary Sphere - University of Cambridge
WEBThe Armillary Sphere. Large image (188K). Very large image (1.6M). Armillary spheres can be divided into two main categories: the observational armillary, as used by Ptolemy and Tycho Brahe; and the demonstrational instrument.
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