Sexagesimal Fractions, are such as have 60, or some multiple of 60, for their denominator. The denominator being usually omitted, $4^\circ$, $59'$, $32''$, $50''$, $16''$, is to be read, 4 degrees, 59 minutes, 32 seconds, 50 thirds, and 16 fourths.

Sextant, denotes the sixth part of a circle, or an arch comprehending sixty degrees. The word sextant is more particularly used for an astronomical instrument made like a quadrant, excepting that its limb only comprehends sixty degrees. (See Quadrant and Mural Circle.)