Timeline of United States inventions (before 1890) -
2021-11-15u2002·u2002An octant, also called 'reflecting quadrant', is a measuring instrument used primarily in navigation.It is a type of reflecting instrument that uses mirrors to reflect the path of light to the observer and, in doing so, doubles the angle measured. This allows the instrument to use a one-eighth circle arc to measure a quarter circle or quadrant.
Get Price