Give me a firm place to stand and i will give your rounding errors far away
Ways to describe the position of a point space.
A point is expressed as P = xi + yi + zi, where i, j and k are unit vectors parallel to the axes of the coordinate system.
A point is made up of r, θ and z. θ is the angle around the z-axis. r is the distance to the point from the z-axis and z is the height of the point above the x-y plane.
A point is made up of r, θ and φ. r is the distance from the origin to the point. θ is the angle around the z-axis and φ is the angle between the z-axis and line to the point from the origin.