According to Wolfram, theta is used for the angle in the XY plane, while phi is used for the angle out of the XY plane (the zenith angle).
It looks like it's the icon that's wrong.
According to Wolfram, theta is used for the angle in the XY plane, while phi is used for the angle out of the XY plane (the zenith angle).
It looks like it's the icon that's wrong.