Assertion: coordinate system's angle | /r/HasProperty | measured in counter-clockwise sense
Facets:
value: on the reference plane
type: LOCATION
value: from the reference direction
type: OTHER
Source sentences:
text: When the system is used for physical three-space, it is customary to use positive sign for azimuth angles that are measured in the counter-clockwise sense from the reference direction on the reference plane, as seen from the zenith side of the plane.