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The Armillary Sphere Armillary spheres can be divided into two main categories: the observational armillary, as used by Ptolemy and Tycho Brahe; and the demonstrational instrument. The armillary sphere described by Ptolemy was a zodiacal instrument of six rings, designed to determine the locations of celestial objects according to the ecliptic co-ordinate system. The orientation of the instrument was establishing by sighting on a celestial object (the sun or a star) whose position in the ecliptic - that is, its celestial longitude - was known. www.hps.cam.ac.uk /starry/armillary.html   (375 words)

Armillary sphere An armillary sphere (also known as spherical astrolabe) is a model of the celestial sphere. Armillary spheres were developed by the Greeks and were used as teaching tools already in the III century B.C. In larger and more precise forms they were also used as observational instruments, being preferred by Ptolemy. Armillary spheres became popular again in the late middle ages; the Danish astronomer Tycho Brahe (1546-1601) constructed several of such instruments. www.ebroadcast.com.au /lookup/encyclopedia/ar/Armillary_sphere.html   (181 words)

Armillary Sphere An armillary sphere is basically a skeletal celestial sphere with a model of the Earth or, later, of the Sun placed in the center. Renaissance painters frequently show spheres on handles in paintings of scholars etc. The central body in the sphere represents the Earth, which was, of course, considered the center of the Universe. The colures and the Equator (the rings defining the sphere) represent the firmament, that is, the sphere upon which the fixed stars reside. www.humboldt.edu /~rap1/EarlySciInstSite/Instruments/ArmSphere/ArmilSph.htm   (0 words)

Armillary Sphere by Antonius Costa of Ferrara, 1676 Armillary Sphere by Antonius Costa of Ferrara, 1676 One of the earliest astronomical instruments, the armillary sphere is primarily a dynamic model of the universe demonstrating the motions of the heavens as observed from the Earth. The overall shape is based on the Ptolemaic concept of the universe as a sphere, with Earth at the centre, an idea established in antiquity. www.nmm.ac.uk /searchbin/searchs.pl?exhibit=it1658z&axis=1140765418&flash=true&dev=   (124 words)

Armillary Sphere   (Site not responding. Last check: ) The spherical wire cage defines the celestial sphere, its pole aligning with the Earth's north pole and its equator defined as the projection of the Earth's equator onto the sphere. The large Armillary Sphere (1m diameter) takes center stage on the floor; the smaller version (diameter 35cm) is a bench top piece. The motions of the planets cannot be explained using the celestial sphere because of the observed retrograde motion. www.fas.harvard.edu /~scdiroff/lds/AstronomyAstrophysics/ArmillarySphere/ArmillarySphere.html   (482 words)

The Armillary Sphere   (Site not responding. Last check: ) People used the armillary sphere to examine the position of celestial bodies from the earth. The armillary sphere's structure was very simple at the very beginning, with three rings and a metal axis. When used for examining the position of stars, the tube was first aimed at a certain star; then the graduation on the equator and Chijing rings was used to pinpoint the star's position in the sky. www.chinaculture.org /gb/en_madeinchina/2005-09/02/content_72400.htm   (225 words)

Brass Armillary Sphere Sundial by Grace Galleries of Harpswell, Maine The outside of the sphere is decorated with signs of the zodiac and is supported by an adjustable thumbscrew clamp which can be set to your local latitude. The Armillary Sphere's arrow points polar north and the gnomon casts a shadow onto the equatorial band which is etched with Roman numerals to indicate the local time. The Armillary Sphere has a heavy solid brass base, and the sundial measures 8 inches (20.3 cm) tall, the ring is 4 3/4 inches (12.1 cm) in diameter, and the sundial weighs 1 1/2 pounds (680 grams). www.gracegalleries.com /Accessories-Brass_Armillary_Sphere.htm   (186 words)

"Explore The Universe" - Featured Artifacts - Tycho Armillary Sphere Armillary spheres large and small were used for centuries to study the sky and to teach about the celestial coordinate system, which astronomers used to locate objects in the sky. This is a full-scale replica of an armillary sphere built and used by Danish astronomer Tycho Brahe in the late 1500s. Danish astronomer Tycho Brahe's observations of the bright new star that appeared in the sky of 1572 proved the heavens were not changeless. www.nasm.si.edu /exploretheuniverse/etu_a_tycho.htm   (240 words)

Brass Armillary Sphere Sundial. Stanley London. The Armillary Sphere is one of the most accurate sundials ever made. The Armillary Sphere's arrow points polar north and the gnomon casts a shadow onto the equatorial band which is etched with Roman numerals to indicate the local time. The Armillary Sphere has a heavy solid brass base, and the sundial measures 8 inches (20.3 cm) tall, the ring is 4 3/4 inches (12.1 cm) in diameter, and the sundial weighs 1 1/2 pounds (680 grams). www.stanleylondon.com /sunsphere.htm   (508 words)

Armillary Sphere   (Site not responding. Last check: ) The Armillary material is Pewter, and some surfaces are a pewter finish while others are in a gold plate. The Earth is represented by a Marble ball in the center. The Ring at the lower left is the Meridian Ring, which adjusts the Latitude. www.puzzlering.net /armillary.html   (139 words)

Galerie J. Kugel   (Site not responding. Last check: ) Initially designed for surveying and demonstrating, armillary spheres became icons and emblems of universality, associated especially with the great age of discovery of the fifteenth and sixteenth centuries when the seafaring nation of Portugal made an image of these spheres into a national emblem. The first sphere presented here (A1) is one of the earliest free-standing examples known and is datable to the first decades of the sixteenth century, thus belonging to this handful of earliest spheres. Italy was another leading country in the construction of armillary spheres with centres in Florence as early as 1520 with the Volpaia dynasty of scientific instrument-makers. www.galerie-kugel.com /c/a_en.htm   (606 words)

Armillary sphere An armillary sphere (also known as spherical astrolabe) is a model of the celestial sphere, invented by Eratosthenes in 255 BC. Armillary spheres were developed by the Greeks and were used as teaching tools already in the III century B.C. A representation of an armillary sphere is present in the modern Portuguese flag and has been a national symbol since the reign of Manuel I. www.xasa.com /wiki/en/wikipedia/a/ar/armillary_sphere.html   (235 words)

Untitled Document   (Site not responding. Last check: ) Armillary spheres have become an icon of science with their elegant rings and beautiful silhouettes. With an armillary sphere, one could track the path of the sun for any given day of the year or determine a star's coordinates. The rims of the armillary spheres are marked "A PARIS Chez G. Gobille a P Ache Royalle." These armillary spheres are solid brass with a rich antique patina finish that will not tarnish or show fingerprints. www.mindspring.com /~gzsmith/_wsn/mapsmiths/Armillary.htm   (311 words)

Armillary Sphere The armillary sphere is not strictly an instrument used for mapping or navigation. The armillary sphere is probably from the 16th century. In addition to the armillary sphere there are figures of Chronus and Hercules and the motto, "Indefessus Agendo" (for which I have found no translation). sio.midco.net /mapstamps/armillary.htm   (171 words)

MASSMED | History of the Armillary Sphere An armillary sphere consists of a skeletal celestial sphere (the basket) inside a vertical ring (the meridian ring). The first armillary sphere was probably invented in the third century BC by the Greek astronomer Eratosthenes. The armillary sphere combines the concept of time, history, and the changing universe into one element. www.massmed.org /AM/TemplateRedirect.cfm?template=/CM/ContentDisplay.cfm&ContentID=4204   (313 words)

Armillary Spheres handcrafted in brass & bronze from Courtyard Sundials Armillary spheres are so called from the Latin armilla for bracelet; they are also known as armillary sundials or equatorial spheres or dials. I supply the Galileo Armillary Spheres set up correctly for the location it is to be used based on the postcode to which it is delivered. My armillary spheres are normally supplied fully assembled but to keep overseas delivery costs down I can supply the Galileo "flat-packed"; assembly is simple and will take you less than 5 minutes. www.courtyardsundials.co.uk /Armillary-Spheres-Galileo.html   (1038 words)

Armillary An armillary sphere (also known as spherical astrolabe) is amodel of the celestial sphere, invented by Eratosthenes in 255 BC. Armillary spheres were developed by the Greeks and were used as teaching tools already in the 3rd century B.C.. A representation of an armillary sphere is present in the modern Portuguese flagand has been a national symbol since the reign of ManuelI. www.altvetmed.com /face/22075-armillary.html   (291 words)

NEW! Greek Armillary Sphere   (Site not responding. Last check: ) Though the exact origin of the armillary sphere is unknown, it is generally accepted that it was invented by Eratosthenes in 255 B.C. The name is derived from the Latin term armilla, which means bracelet or circle. In ancient times the armillary was used as a teaching tool by the Greeks to study the heavens. Armillary spheres became quite popular through the late middle ages and several civilizations throughout history have used armillary spheres for astronomy, including China during the Han Dynasty (206 B.C-220 A.D). www.ancient-empires.com /negrarsp.html   (204 words)

Armillary Sphere A model of the cosmos as it was perceived before the 1600s, the armillary sphere consists of a number of graduated brass rings representing the chief celestial circles and demonstrates the basic principles of astronomical motion and horology (the science of time measurement). The first armillary sphere was probably invented in the third century BC by the Greek astronomer Eratosthenes. By the early 1500s Copernicus had overthrown the accepted geocentric premise and the spheres began to be built with the sun in the center. www.piam.com /mms_garden/extra1.html   (312 words)

Armillary Sphere Sundial Made from silicon bronze, the sphere is 0.5m in diameter, and is mounted on a rock for easy reading. Armillary sphere sundials, modeled on the celestial or terrestrial sphere, are constructed from three or more interlocking rings which provide support for the rod-like gnomon, which forms the axis of the sphere, and casts the time-telling shadow on the equatorial ring. Another fine armillary sphere in Canberra can be seen in the north corner of Parliament Drive outside Parliament House. www.anbg.gov.au /memorials/sundial.html   (276 words)

Armillary Sphere - Gemini Copper Sundial Armillary Spheres are models of the celestial sphere based on the Ptolemy theory of the universe with the earth being stationary at the centre. The celestial sphere is imagined as a sphere with the stars fixed onto its interior and the earth at its centre. Although we now know this to be inaccurate, it does not effect the working of the Armillary Sphere since to an observer on Earth the motion of the Sun and Stars appears the same. www.birstall.co.uk /products/wsungeminicopper.html   (115 words)

Armillary Sphere The armillary sphere is a model of the universe as it was conceived of in the Renaissance, composed of connected rings linking the poles and representing the equator and the ecliptic. Renaissance scientists and public figures often had their portraits painted showing them with one hand on a Ptolemaic (earth-centered) or Copernican (sun-centered) armillary sphere, which represented the height of wisdom and knowledge. The Armillary sphere measures 7" wide and 11" tall over all. www.thelibraryshop.org /arspher.html   (91 words)

Armillary Spheres - Home Furnishings & Decor   (Site not responding. Last check: ) Some armillary spheres are elegantly complex, but two points are common to all designs.  Every armillary has a stand and a celestial sphere.  Inside the sphere are interlocking rings holding the gnomon-the pointy part that casts a shadow on the face to measure time. The armillary sphere was one of the first complex mechanical devices ever devised.  It was so popular during the Renaissance that scientists and sophisticates had armillary spheres included in their portraits.  Look for them in museum paintings. An armillary sphere can be hard to find, though they do turn up in parks or personal gardens.  In our yards, armillary spheres are interesting features certain to draw curiosity and commentary.  Several styles and sizes are available, from simple models costing around $30, up to extravagant wrought iron spectacles costing $1000. www.homefurnish.com /patiolawngarden/gardendecor/armillaryspheres.aspx   (281 words)

Armillary Spheres - The Brass Gallery Armillary spheres were used well into the seventeenth century to teach the concepts and coordinate systems of spherical astronomy. An armillary can be used to demonstrate, for example, the angles at which the sun rises and sets at different times of the year. Virginia Metalcrafters' armillary spheres are unique, because they are made in America, and because they are made of only the finest materials, ensuring that your armillary will weather the elements and add lasting beauty to your garden. www.brassgallery.com /armillary   (124 words)

armillary sphere - definition of armillary sphere by the Online Dictionary from Datasegment.com [1913 Webster] Armillary sphere, Crystalline sphere, Oblique sphere,. [1913 Webster] Armillary sphere, an ancient astronomical machine composed of an assemblage of rings, all circles of the same sphere, designed to represent the positions of the important circles of the celestial sphere. [1913 Webster] armillary sphere - WordNet (r) 2.0 (August 2003) : armillary sphere n : a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars [syn: armilla] onlinedictionary.datasegment.com /word/armillary+sphere   (313 words)

Armillary Sphere - Auto Insider   (Site not responding. Last check: ) The Invention of the Armillary Sphere - Miniature representations of the earth in the form of globes and terrain models have a long history. The armillary sphere, with its interlocking rings that illustrate the circles of the sun, moon, known planets...(Continue Reading) The armillary sphere, with its interlocking rings that illustrate the circles of the sun, moon, known planets, and important stars as well as......(Continue Reading) www.auto-insider.com /armillary-sphere.html   (175 words)

Armillary/Zodiac Sphere | Nauticalia Armillary spheres were developed to aid scientific debate, with Earth representing the centre of the Universe in those made according to the Ptolemaic system, and with the Sun as centre in the (later) Copernican model. Our models are of 16th century Ptolemaic versions, so the central body represents the Earth, with the rings around it defining the firmament, or the sphere upon which the fixed stars and planets reside. The band going around the sphere, at an angle to the equator represents the Zodiac, along with the twelve star signs are represented by the appropriate symbols. www.nauticalia.com /uk-info/furnishing/decor/armillary_zodiac_sphere/4635.html   (145 words)

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