In
geometry the
orientation,
angular position, or
attitude of an object such as a
line,
plane or
rigid body is part of the description of how it is placed in the
space it is in. Namely, it is the imaginary
rotation that is needed to move the object from a reference placement to its current placement. A rotation may not be enough to reach the current placement. It may be necessary to add an imaginary
translation, called the object's location (or position, or linear position). The location and orientation together fully describe how the object is placed in space. The above mentioned imaginary rotation and translation may be thought to occur in any order, as the orientation of an object does not change when it translates, and its location does not change when it rotates.