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. Approx. 42cm in height, 34cm by 30cm in width.

Elegantly designed 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, approx. 51cm in height 23cm in width.

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

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

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 approximately 76cm high and 61cm by 94cm wide

A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies, 12cm by 10cm.

A silver gimbal on a stand. A gimbal is a device consisting of two rings mounted on axes at right angles to each other so that an object, such as a ship\'s compass, will remain suspended in a horizontal plane between the... (continued)

A device consisting of two rings mounted on axes at right angles to each other so that an object, such as a ship\'s compass, will remain suspended in a horizontal plane between them regardless of any motion of its support. Often used in the plural.