In the same way, the binormal gives us a hard time because it stands vertically to our plane of projection and not - as needed - on the second small circular path that is tilted against the plane of projection (equation XXI does not affect the direction of the binormal). Nevertheless, we continue our calculation using false values - just to learn from our mistakes. Certainly, there is an unknown principle hidden behind this n the content of which will possibly be revealed in part due to the errors in our calculation.

Next, we forcefully rotate the binormal toward the desired direction and call the indefinable integral:

Hence:

  XXIII