八はち分ぶん儀ぎ

noun

octant

A navigational instrument used for measuring angles, especially in celestial navigation. The term is technical and primarily encountered in historical or maritime contexts.

• 八はち分ぶん儀ぎは、18世せい紀きの航こう海かいで広ひろく使つかわれた。

  The octant was widely used in 18th-century navigation.