astroscope

noun astroscopes

1. An old astronomical instrument formed of two cones, on whose surface the constellations were delineated. The astroscope is the invention of Willliam Shuckhard, formerly professor of mathematics at Tubingen, who published a treatise expressly on it in 1698.
2. An astrological chart. You can also construct your astroscope on a wheel, just as professional astrologers do.
3. A telescope powerful enough to see astronomical bodies. astroscopes and other high precision optical devices