Etymology
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sextant (n.)

instrument for determining latitude, 1620s, from Modern Latin sextans, said to have been coined c. 1600 by Danish astronomer Tycho Brahe, from Latin sextans "a sixth," from sex "six" (see six). So called because the sextans has a graduated arc equal to a sixth part of a circle.

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Definitions of sextant

sextant (n.)
a unit of angular distance equal to 60 degrees;
sextant (n.)
a measuring instrument for measuring the angular distance between celestial objects; resembles an octant;
From wordnet.princeton.edu