The implementations above always draw only complete octants or circles. Each node in an octree subdivides the space it represents into eight octants. Examples of these very similar octants are in the photos in this article. The octant shower detectors were outside the time-of-flight detectors in each of the octants. Again, by reflecting these points in all the octants, a full circle results. These octants were available with many options. These hyperplanes divide space into eight trihedra, called "octants". The silicon detector was a three-layer device, arranged in octants. By the late 18th century, navigators replaced their prior instruments with octants and sextants. Some bubble octants have accessories to make the averaging simpler. To project the sphere to the polyhedron, the Earth is divided into eight octants. For unknown reasons, this feature was not implemented on octants in general use. I referenced the northwest section and subsequent octants proceeded clockwise in alignment with compass directions. Most commonly, octants are seen on the compass rose. Early octants were constructed primarily in wood, with later versions incorporating ivory and brass components.