Hand-cranked orrery, showing movements of Mercury, Venus, and Earth around the Sun, and the Moon around the Earth Printed, colored, and varnished dial Brass wheels and gears, Sun and Moon, ivory planets. 18th century.
This instrument is clear evidence of the links between the astrolabe and astrology. On one side is an astrolabe for a single latitude, and on the other an astrological volvelle, used to find the positions of planets and other celestial bodies, especially in relation to the traditional astrological houses.
Spherical Astrolabe by Musa -This spherical astrolabe is the only complete example of its kind to survive. It was used to make astronomical calculations and is of Eastern Islamic origin. All the inscriptions are in Eastern Kufic Arabic and it is signed ‘Work of Musa’, Musa standing for an unknown instrument maker. Musa, Spherical astrolabe