An armillary sphere is a model of objects in the sky, 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. It differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations rather than a skeletal framework of rings. The device was invented separately, in ancient China possibly as early as the 4th century BC and in ancient Greece during the 3rd century BC, with later use in the Islamic world and medieval Europe.
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It was invented separately, in ancient China possibly as early as the 4th century BC and ancient Greece during the 3rd century BC, with later uses in the Islamic world and Medieval Europe.
Also in Geography Atlas: where this subject originated.
Source Armillary sphere (Wikipedia)LeadQuote, Lead
It was invented separately, in ancient China possibly as early as the 4th century BC and ancient Greece during the 3rd century BC, with later uses in the Islamic world and Medieval Europe.
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Astrolabe (Wikipedia)
WikipediaAssociated With: Astrolabe, History section, Ancient era subsection, armillary sphere sentenceQuote, Associated With: Astrolabe, History section, Ancient era subsection, armillary sphere sentence
An astrolabe is essentially a plane (two-dimensional) version of an armillary sphere, which had already been invented in the Hellenistic period
Shen Kuo (Wikipedia)
Associated With: Shen Kuo, Astronomy paragraphQuote, Associated With: Shen Kuo, Astronomy paragraph
Shen Kuo made improved designs of the armillary sphere, gnomon, sighting tube, and invented a new type of inflow water clock.
Armillary sphere (Wikipedia)
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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 coordinate system and other astronomically important features, such as the
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