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Topic: Equatorial armillary sphere

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	Celestial sphere - Wikipedia, the free encyclopedia
		The celestial sphere is divided by the celestial equator.
		In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of "gigantic radius", concentric and coaxial with the Earth.
		In the latter case it is centred around an observer on the surface of the Earth and then horizontal parallax cannot always be ignored; especially not for the Moon.
	en.wikipedia.org /wiki/Celestial_sphere (417 words)

	Hipparchus (astronomer) - Wikipedia, the free encyclopedia
		Hipparchus was the first to show that the stereographic projection is conformal, and that it transforms circles on the sphere that do not pass through the center of projection to circles on the plane.
		Hipparchus seems to have used a mix of ecliptic coordinates and equatorial coordinates: in his commentary on Eudoxos he provides the polar distance (equivalent to the declination in the equatorial system) and the ecliptic longitude.
		He confirmed that precession affected the entire sphere of fixed stars (Hipparchus had speculated that only the stars near the zodiac were affected), and concluded that 1° in 100 years was the correct rate of precession.
	en.wikipedia.org /wiki/Hipparchus_(astronomer) (5882 words)

	Celestial Sphere - Search Results - MSN Encarta (Site not responding. Last check: 2007-11-01)
		Celestial Sphere, imaginary sphere of the heavens, with the earth at its center.
		The equatorial coordinate system is a coordinate system fixed on the sky.
		The astronomy of the Pythagoreans marked an important advance in ancient scientific thought, for they were the first to consider the earth as a globe...
	ca.encarta.msn.com /Celestial_Sphere.html (165 words)

	Articles - The History of the NI Armillary (Site not responding. Last check: 2007-11-01)
		Prior to the development of the telescope in the 17th century, the armillary sphere was the most complex navigational device known.
		The Sphere was used to determine both the right ascension and the declination of a star through alignment of the equator, tropics, moon, sun, and planets.
		In addition to the armillary sphere, other critical navigational tools, such as the sextant, quadrant, and astrolabe were all calibrated sighting devices employed to determine the angular positions of stars and planets.
	www.nauticalinstitute.ca /Articles/Armillary.htm (278 words)

	Tycho Brahe - Worldview Network (Site not responding. Last check: 2007-11-01)
		An armillary sphere is a kind of celestial globe in which the great circles of the sky are represented as a skeletal framework of intersecting rings.
		Conventional armillary spheres flexed under their own weight, but Tycho gave this instrument a radically new and simple design, eliminating such problems, and at the same time making it very convenient to use.
		The diameter of the declination circle was 272 cm and the diameter of the equatorial circle was 350 cm.
	www.landskrona.astronomy.museum /wvn.asp?p=b&s=i&ss=3 (438 words)

	The Observational Armillary Sphere
		In addition, there is considerable evidence of the use of armillary spheres for observations, most notably at the Marâgha Observatory of the thirteenth century, the Samarkand Observatory of the fifteenth century, and the Istanbul Observatory of the sixteenth century.
		The observational armillary sphere was one of the instruments discussed in the Libros del Saber de astronomia produced under the auspices of King Alfonso X of Castile in the thirteenth century.
		Independent development of the observational armillary occurred in China, and the instrument was an important item of observatory equipment from the first century A. Chinese observational armillary spheres were mostly of the equatorial form.
	www.hps.cam.ac.uk /starry/armillobser.html (578 words)

	Tycho Brahe and the Armillary Sphere
		Tycho Brahe's reputation as the pre-eminent observational astronomer of the sixteenth-century derives from his construction and use of a range of astronomical instruments of large size and remarkable accuracy.
		The 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.
		Subsequently, Tycho constructed a device he called "The Great Equatorial Armillary Instrument, Comprising One and a Half Circles." The one circle of this instrument was about 2.6 m in diameter, and was mounted on a self-centering axis.
	www.hps.cam.ac.uk /starry/tychoarmill.html (525 words)

	Decorative Accessories
		The Armillary Sphere Sundial is one of the most accurate sundials ever made, and can easily be set to read local time based on the position of the sun.
		The Armillary Sphere's arrow points polar North and the gnomon casts a shadow onto the equatorial band which is cast with raised Roman numerals to indicate the local time.
		The Armillary Sphere is large and heavy, measuring 16 1/2 inches (42 cm) tall, the equatorial band is 13 inches (33 cm) in diameter, and the sundial weighs 7.8 pounds (3.5 kg).
	www.gracegalleries.com /Accessories-Armillary_Sphere_Garden_Sundial.htm (190 words)

	Armillary Sphere handcrafted in brass & bronze
		This photo of the Courtyard Armillary Sphere was taken on the top of the Fingest column the top of which measure is 11" (28cm).
		Armillary spheres are so called from the Latin armilla for bracelet; they are also known as armillary sundials or equatorial spheres or dials.
		My armillary spheres are normally supplied fully assembled but to keep overseas delivery costs down I can supply the Courtyard "flat-packed"; assembly is simple and will take you less than 5 minutes.
	www.courtyardsundials.co.uk /Armillary-Sphere-Courtyard.html (1091 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.
		In the case of the ANBG sundial this equatorial ring interlocks with a meridian and polar ring.
	www.anbg.gov.au /memorials/sundial.html (276 words)

	The Antique Sextant - Large Solid Brass Armillary Sphere Garden Sundial
		The Armillary Sphere Sundial is one of the most accurate sundials ever made, and this model is perfect for a garden sundial or interior home decoration.
		Time is determined by the arrow of the Armillary Sphere which points polar North and the gnomon casts a shadow onto the equatorial band, which is cast with raised Roman numerals.
		The Armillary Sphere is large and heavy, measuring 16 1/2 inches (42 cm) tall, the equatorial band has a diameter of 13 inches (33 cm), and the sundial weighs 7.8 pounds (3.5 kg).
	www.antiquesextant.com /armillarylrg.htm (511 words)

	Learn more about Hipparchus in the online encyclopedia. (Site not responding. Last check: 2007-11-01)
		Hipparchus also observed solar equinoxes, which may be done with an equatorial ring: its shadow falls on itself when the Sun is on the equator (i.e.
		After that in 135 BC, enthusiastic about a nova star in the constellation of Scorpius, he measured with an equatorial armillary sphere ecliptical coordinates of about 850 (falsely quoted elsewhere as 1600 or 1080) and in 129 BC he made first big star catalogue.
		Hipparchus and his predecessors mostly used simple instruments for astronomical calculations, such as the gnomon, astrolabe, armillary sphere etc.
	www.onlineencyclopedia.org /h/hi/hipparchus.html (6619 words)

	armillary sphere
		The celestial sphere is modeled by a skeletal framework of rings (armillaries, from the Latin “armilla,” for “ring”), each representing an important circle, such as the ecliptic or celestial equator.
		Some of the rings may be moveable to enable the sky’s appearance to be shown at different times and latitudes.
		Armillary spheres are also found in the form of equatorial sundials, in which the ring representing the celestial equator is graduated with hours.
	www.daviddarling.info /encyclopedia/A/armillary_sphere.html (160 words)

	Armillary & Armillary Sundials at OutdoorDecor.com - Armillaries, Armillary Sundials & Sundial Pedestals
		Armillary spheres were historically used to teach the concepts of spherical astronomy.
		Comprised of a skeletal sphere, a model of the Earth is at the center of the armillary, with the encircling bands representing the outer sphere of fixed stars.
		The armillary sphere sundial tells solar time when the arrow, corresponding with the Earth’s axis, casts a shadow on the equatorial band.
	www.outdoordecor.com /parentCategory.asp?CSN=339&ESRC=WEBGOOGL1005 (176 words)

	20 European Demonstrational Armillary Sphere - Imported Equatorial Armillary Sundials
		Our 20 European Demonstrational Armillary Sphere is a beautiful reproduction showing relationships among important lines and points in the sky.
		These instruments consist of a set of graduated rings representing circles on the celestial sphere allowing one to track the path of the sun for any given day of the year or determine a star's coordinates.
		This armillary sphere is crafted of solid brass with a rich antique patina finish that will not tarnish or show fingerprints.
	www.gardendecorshop.com /Imported-20-European-Demonstrational-Armillary-Sphere.html (151 words)

	8 Brass Armillary Sphere Sundial - Imported Equatorial Armillary Sundials
		Our 8 Brass Armillary Sphere Sundial is a beautiful solid brass antique reproduction of the most accurate sundials ever made.
		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.
	www.gardendecorshop.com /Imported-8-Brass-Armillary-Sphere-Sundial.html (147 words)

	Armillary Sphere (Site not responding. Last check: 2007-11-01)
		The instrument on the stamp is Tycho Brahe's Great Equatorial Armillary.
		Built in 1585, it is an armillary sphere reduced to its bare essentials.
		The armillary sphere on the stamp is a replica made in 1437 during the Ming Dynasty of an armillary made during the Song Dynasty (960-1127).
	sio.midco.net /mapstamps/armillary2.htm (72 words)

	Chinese star maps - Wikipedia, the free encyclopedia
		Tang Dynasty Armillary Sphere 唐代渾儀 and 黃道遊儀 by Yixing Priest 一行和尚 (张遂) and Liang Lingzan 梁令瓚
		Song Dynasty Armillary Sphere 北宋簡化渾儀 by Shen Kua沈括 and Huangfu Yu Simplied version of Tang Dynasty Device, removed the rarely used moon orbit.
		Ming Dynasty diagrams of Armillary spheres and Celestrial Globes by Xu Kuangci 徐光啟
	en.wikipedia.org /wiki/Chinese_star_maps (1493 words)

	Armillary Sundials - OutdoorDecor.com
		An armillary sundial tells solar time when the arrow, corresponding with the Earth’s axis, casts a shadow on the equatorial band.
		Armillary sundials have been utilized for hundreds and hundreds of years to visually convey the concepts of spherical astronomy.
		These armillary sundials are ideal for any classically themed outdoor decorative scheme.
	www.outdoordecor.com /category.asp?csn=341 (109 words)

	Equatorial Sphere handcrafted in brass & bronze
		Equatorial spheres or armillary spheres are so called from the Latin armilla for bracelet.
		of the Kepler Equatorial Sphere can be adjusted to suit different locations and will be set up correctly for the location it is to be used based on the postcode to which it is delivered.
		The base of the Kepler Equatorial Sphere can be securely fixed to your plinth or pedestal with a stainless steel bolt in to a raw plug; full instructions are supplied
	www.courtyardsundials.co.uk /Equatorial-Sphere-Kepler.html (555 words)

	Armilary Sundial Update \| Armilary Sundial Directory (Site not responding. Last check: 2007-11-01)
		Equatorial atlas a the with for and sun dial sundial clock garden ornament outdoor decorative craft design of on armillary sphere equatorial armilary sundials armillaries spheres accessories.
		Although these are not sundials, they have taken the armillary sundial and reduced armillary sundial antique armillary about armilary sphere sundial.
		The Armillary sphere is brass and is pierced with an arrow for accurate timekeeping.
	www.sundialtime.info /armilary-sundial.html (1254 words)

	Tycho's 1581 Armillary Sphere
		Solar Physicists : Tycho > Tycho's 1581 Armillary Sphere
		Armillary sphere, 1.6 meter in radius, built in 1581.
		Tycho rapidly gave up on using large versions of classical armillary sphere, as he found their accuracy compromised by flexing and bending due to the great weight of the various components.
	www.hao.ucar.edu /Public/education/bios/tycho.3.4.html (77 words)

	The Antique Sextant - Brass Armillary Sphere Sundial
		We are pleased to offer the Armillary Sphere, which is one of the most accurate sundials ever made.
		To determine the local time the Armillary Sphere's arrow points polar north and the gnomon casts a shadow onto the equatorial band that is etched with Roman numerals.
		The Armillary Sphere features 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.antiquesextant.com /sunsphere.htm (463 words)

	Brass Armillary Sphere Sundial. Stanley London.
		The Armillary Sphere is one of the most accurate sundials ever made.
		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).
		We also have offer a decorative Armillary Sphere Sundial on a hardwood base and a Large Solid Brass Armillary Sphere Garden Sundial.
	www.stanleylondon.com /sunsphere.htm (472 words)

	Fort Lauderdale Museum of Discovery and Science - Press Box
		Spheres At-Your-Fingers: Interactive models of an armillary sphere and celestial globe are available for hands-on exploration.
		Built in 1439 CE, this armillary sphere, used to measure the positions of stars, is decorated with four elegant dragons.
		Completed in 1092 CE, this intricate water-powered clock combined astronomical observation and timekeeping, including an armillary sphere, a celestial globe, and a complicated series of ceramic figures, which announced the time.
	www.mods.org /press/pressdragonskies1.htm (1560 words)

	Press Release Dragon Skies (Site not responding. Last check: 2007-11-01)
		An equatorial west-east star chart shows the way experts in imperial China divided the sky is also from that time.
		The original armillary sphere with the dragons was built in 1439 C.E. Armillary spheres measured positions of stars.
		It combines a water-powered clock with astronomical and time-keeping mechanisms including an armillary sphere, a celestial globe and a complicated series of ceramic figures which announced the time.
	www.cinemind.com /diagonalley/dragonskies.html (894 words)

	NASS FAQ - Dial Types - Equatorial
		Armillary dials are equatorial dials with extra circles emulating those found on armillary spheres.
		A true armillary sphere is not a sundial but a model of the heavens.
		The extra circles on an armillary dial actually hinder timkeeping by blocking the sun at various times.
	sundials.org /faq/types/equatorial.htm (121 words)

	Sci-Philately - Arts & Sciences Libraries, UB Libraries
		Aristarchus of Samos (3rd century BC) considered the sizes and distances of the sun and the moon, and was the first to try to calculate the distances of these bodies geometrically.
		Furthermore, he advanced the theory that the sun was at rest at the center of the sphere of fixed stars, and that the earth and planets revolved around the sun.
		Identified as a sextant in Scott, it is almost certainly the great equatorial armillary sphere (1585).
	ublib.buffalo.edu /libraries/asl/exhibits/stamps/cosmo1.html (1282 words)

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