Definition of: sextant

(seks′tənt) noun
1. An instrument for measuring angular distance between two objects, as between a heavenly body and the horizon, by a double reflection from two mirrors: used especially in determining latitude at sea.
2. The sixth part of a circle; an arc of 60 degrees. [<L sextans, antis the sixth part <sextus sixth]
SEXTANT
a. Scale.
b. Clamp screw.
c. Tangent screw.
d. Reading lens.
e. Glass shades.
ƒ. Horizon glass.
g. Index glass.
h. Telescope.
i. Movable arm.
j. Handle.