六ろく分ぶん儀ぎ

noun

sextant

A navigational instrument used to measure the angle between two visible objects, especially for determining latitude and longitude at sea.

• 船ふな乗のりは六ろく分ぶん儀ぎを使つかって現げん在ざい位い置ちを確かく認にんした。

  The sailor used a sextant to confirm his current position.