四し分ぶん儀ぎ

noun

quadrant (instrument)

A historical astronomical and navigational instrument for measuring angles up to 90 degrees. Also called 象限儀.

See also: 象限儀

• 四し分ぶん儀ぎは、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.