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Figure shows a locus of the figure axis of a symmetrical top on a unit sphere such that

##\dot{\theta}=\dot{\psi}=0## at the upper bounding circle. Where

##{\theta}## is the polar angle and ##{\psi}## is the azimuthal angle.

Suppose the figure axis is at the upper circle, since ##\dot{\theta}=0## at the upper bounding circle, we should expect ##{\theta}## to remain unchanged hence fixed on the upper circle. However the figure shows a change in ##{\theta}##. Why is that so?

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