[f. ASTRO- + Gr. -σκοπος observer.] An astronomical instrument formerly in use, ‘composed of two cones, on whose surface the constellations with their stars were delineated.’ Chambers, Cycl. Supp.
1675. Sherburne, Sph. Manilius, C ij b. These Instruments are not true Astroscopes.
1753. Chambers, Cycl. Supp., s.v., The astroscope is the invention of Wil. Schukhard, formerly professor of mathematics at Tubingen … in 1698.
1867–77. Chambers, Astron., 913.
