By 1780, the octant and sextant had almost completely displaced all previous navigational instruments. Use and adjustment of the octant is essentially identical to the navigator's sextant. The octant, also called reflecting quadrant, is a measuring instrument used primarily in navigation. This replaced the Davis quadrant and the octant as the main instrument for navigation. John Hadley and Thomas Godfrey both get credit for inventing the octant. Some versions use Bresenham's principles of integer incremental error to perform all octant line draws. It lies in the dim constellation Octans, the Octant. The generalization of an octant is called orthant. Only the second is well known and is the familiar octant. It was not considered better than the Hadley octant and was less convenient to use. The Sigma Octant contains Tau, Sigma and Rho Sectors. A basic octant with graduations directly on the wood frame were least expensive. They quickly constructed the most powerful fleet of starships in the now-ravaged Alpha Octant. The Sargasso Octant contains Zeta, Eta, and Theta Sectors. Features of Octant VIII were also denominated in honor of Copernicus, Kepler, and Galileo.