Your position in 3d is given by two angles (+ radius, which in your case is constant)

```
x = r * cos(s) * sin(t)
y = r * sin(s) * sin(t)
z = r * cos(t)
```

here, **s** is the angle around the z-axis, and **t** is the *height* angle, measured ‘down’ from the z-axis.

The picture below shows what the angles represent, s=*theta* in the range 0 to 2*PI in the xy-plane, and t=*phi* in the range 0 to PI.