Armillary sphere was an instrument used in Indian astronomy. 
[[Template:Ref-par]] wrote on the Armillary sphere his [[Template:Ref-GolaD]]. He described in great detail it's general arrangement. He started with the viṣuvad circles (3 main great circles), namely the 
|Solstiital Colure||Dakṣiṇottara||a north-south circle|||
|Equinoctial celestial equator||Ghaṭikāmaṇḍala||perpendicular to Dakṣiṇottara|||
|Equinoctial colure||-||perpendicular to Ghaṭikāmaṇḍala and Dakṣiṇottara|||
He mentioned svastika - 4 crosses made by the equinoctial colure with the other viṣuvads, at the 'cardinal points'.
Next he described the Apama-vṛtta (ecliptic), ahorātra-vṛtta (diurnal circles), orbits of the planets, the pāta (lunar nodes), and finally the Nakṣatragola / Bhagola (Starry sphere), the Khagola (Celestial sphere, outside of the starry sphere), the clay Earth, another circle (Unmaṇḍala) to hold it all, and spacers (śara-daṇḍikā).
|madhyalagna||merdiain ecliptic point|
|ḍṛṇmaṇḍala||above the madhyalagna, where planet is seen|
|dṛggatijivāvalaya||ahead of the madhyalagna|
Each of the 5 star-planets gets:
For more detail, please see the article on Lalla.
|kakṣa||hoops to sustain the Earth model|
|bhagaṇa||degrees of the circle|
|aṅgula||divisions of bhagaṇa|
|viṣuvat||equinoxes, also listed as equator|
|krānti||"circle of declination" (runs through both solstices, planets turn on it)|
|lagna||orient ecliptic point - at orient horizon|
|astamgacchat||occident ecliptic point|
|antyā||jyā between kṣitija and madhya|
|caradala||sun's ascensional difference|
|interval between viṣuvat & kṣitija|
- The Seven Sages (saptarṣayas) of Agastya, Brahmā, etc.
Automatic armillary spheres
The Sūrya Siddhānta describes an automatically moving armillary sphere, involving quicksilver (mercury), water, and oil. It declines to give a description. Āryabhaṭa, Lalla, and others give similar and (usually vague) descriptions of automatic armillary sphere devices. 
These may be amongst the earliest analog computers, comparable with the Antikythera Mechanism, Zhang Heng and his water-powered armillary sphere, Al-Jazari and astronomical clocks, etc. Please see the article on mercury (metal) for more information. Template:Fact