Spherical coordinate system
A coordinate system in which you specify the location of an object as 
, 
, and 
:
, , and :■ is the distance from the origin of the coordinate system to a location.
is the distance from the origin of the coordinate system to a location.■ is the angle in the zx plane of the coordinate system to a location, as in cylindrical coordinates.
is the angle in the zx plane of the coordinate system to a location, as in cylindrical coordinates.■ is the angle between the y-axis of the coordinate system and the line connecting the origin of the coordinate system and the location.
is the angle between the y-axis of the coordinate system and the line connecting the origin of the coordinate system and the location.