13th Century Astrolabe
ca. 1200-1300 AD
A 13th Century Astrolabe – a compact instrument used to observe and calculate the position of celestial bodies before the invention of the sextant.
Comments: A unique piece I have among my personal collections is this extremely old 7-piece bronze or brass (device) which I acquired while working in Africa decades ago. It is 7 1/2″ across, with bronze or brass charts that can overlay other different interlocking maps or different constellations in varying arrangements.