# ORTHOGONIAL

, in Geometry, is the same as rectangular, or right-angled.—When the term refers to a plane figure, it supposes one leg or side to stand perpendicular to the other: when spoken of solids, it supposes their axis to be perpendicular to the plane of the horizon.

ORTHOGRAPHIC or Orthographical *Projection
of the Sphere,* is the projection of its surface or
of the sphere on a plane, passing through the middle of
it, by an eye vertically at an infinite distance. See PROJECTION.