"The sextant, an instrument of reflection used by navigators for measuring the altitudes of heavenly bodies."—Finley, 1917

Sextant

"The sextant, an instrument of reflection used by navigators for measuring the altitudes of heavenly…

"Sextant. An important instrument of navigation and surveying, for measuring the angular distance of two stars or other objects, or the altitude of a star above the horizon..." a, handle; b, c, mirrors; d, ring; e, telescope; f, arm; g, reading-lens; h, arc; i, screw; j, tangent screw. -Whitney, 1911

Sextant

"Sextant. An important instrument of navigation and surveying, for measuring the angular distance of…