象しょう限げん儀ぎ

noun

quadrant (astronomical instrument)

A historical astronomical instrument used for measuring angles up to 90 degrees, often in navigation and astronomy.

• 象しょう限げん儀ぎは、天てん体たいの高こう度どを測はかるのに使つかわれた。

  The quadrant was used to measure the altitude of celestial bodies.