ARMILLA, ARMIL or Armillary Sphere (from the Lat. armilla, a bracelet), an instrument used in astronomy.
armillary sphere
An ancient Greek, Arabic, and medieval device used to show and observe the movements of astronomical bodies.
Armillary sphere
An armillary sphere (also known as a spherical astrolabe, armilla, or armil) is a model of the celestial sphere, invented by Eratosthenes in 255 BC.
armillary sphere: An instrument consisting of an arrangement of rings, all of which are circles of the same sphere, used to show the relative positions of the celestial equator, ecliptic, and other circles of the clestial sphere.
armillary: (pron. ar-mil-ar-y) (or armillary dial; some authors also use the term armillary sphere) a form of equinoctial sundial which comprises, as a minimum, ...
Armillary Sphere
Ancient Greek, Arabic and medieval alt-azimuth device, comprising a calibrated ring fixed in the meridian plane, within which a second concentric ring, also calibrated, was mobile around a vertical axis.
Aromatic, Aromaticity ...
Armillary sphere (渾å"€)
The earliest development of the armillary sphere in China goes back to the astronomers Shi Shen and Gan De in the 4th century BC, as they were equipped with a primitive single-ring armillary instrument.
ARMILLARY SPHERE
An armillary sphere is an instrument from the 1500s that was used to determine the relative positions of the , the , the planetary orbits, etc. This device consisted of a series of concentric rings.
The armillary sphere, a three-dimensional representation of the movements in the celestial sphere, was invented in Han China by the 1st century BCE.
52 BC - Shou-chang uses armillary ring
141 - Claudius Ptolemy _Megale Mathematike Syntaxis_ [or Almagest]
499 - Aryabhata _Aryabhatiya_
646 - Cheomseongdae astronomical observatory near Kyongju, South Korea (formerly Silla) ...
The instruments in use before the invention of the telescope include the sextant, quadrant, astrolabe, and armillary sphere. These are all calibrated sighting devices for determining the angular positions of stars and planets.
Thus, the Chinese used armillary spheres, (Danish late 1500's) used long sighting 'tubes', neolithic farmers made Stonehenge to point to midsummer sunrise, and Ptolemy noted planet positions with respect to stars.
They show coordinates and were prepared for use with an "armillary sphere" - a sphere that consists of a number of rings arranged so as to model the circles of the celestial sphere.
Young stars typical of those found in spiral arms (Population I stars). [H76]
Armillary Sphere ...
 See also: Astronomy, Sun, Time, Earth, Moon
  
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