Astrolabe with lunar gearing (14th cent.)


Brass, diameter 133 mm, weight c. 560 grams
CHF 2400.00, EUR 2087.00

Astrolabe with lunar gearing (14th cent.)

The reconstruction follows the "french" astrolabe with lunar gearing (Science Museum, London). Original-instrument ca. 1300 AD, diameter 151 mm. Because of the projection and the direction of sight from the north, we find an uncommon appearance of the astrolabe. The centre of the instrument corresponds to the celestial south pole, and the outermost circle of the plate is the tropic of Cancer, the sun-position in summer-time! Two plates with 4°-almucantars and unequal hours, for lat. 42°/46° and 50°/54°. No azimuth-circles. Rete with 22 star positions and calendar-circle (month in latin, not french). Above the rete is the double-rule (sun), with gearing to the moon-pointer. The gearing is connected with a hidden cog-wheel below the calendar-circle. Back with double sun-quadrant (lat. 50°/54°) and shadow-square. Double-rule with diopters.
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