**The equations of motion**

I have started the **Dzhanibekov effect series** with quaternions, but that is because of my personal attraction to quaternions. Some years ago I coauthored a paper on Quaternions and Monopoles. The monopoles there are the exotic “*magnetic monopoles*” that are lake fairies. Some physicist say they have seen them in the woods, but the majority of physicists take it as a joke. Quaternions are also somewhat exotic. I do not know if magnetic monopoles have any relation to Dzhanibekov effect, though, in fact they may have one – but that is for the physics of the future. For the physics of today, for the physics of a cosmic spinning and flipping nut, we need the physics of a rigid body. That is part of **classical mechanics**.

According to Wikipedia

In physics, a rigid body is an idealization of a solid body in which deformation is neglected. In other words, the distance between any two given points of a rigid body remains constant in time regardless of external forces exerted on it.

I should say that the concept of a rigid body becomes somewhat iffy when we want to take into account what **Albert Einstein** taught us about first *special*, and then **general relativity**. I did not see yet a satisfactory relativistic theory of Dzhanibekov effect. What I know is that some physicists trying to sell their fantastic ideas to the investors (example **G. Shipov**) try to relate Dzhanibekov effect to “**torsion fields**” and “**4D gyroscopes**“. I have published some comments on this subject in International Journal of Unconventional Science. “Comments on Chapter 5 of G. I. Shipov’s “A Theory of Physical Vacuum”. Part I” is available in English. The second part, dealing with Shipov’s “*4D gyroscopes*” is for now available only in Russian, but it will be translated into English soon.

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