This answer to Is there a name for the great circle where latitude and longitude are equal? says (in part):
More generally, a clélie is the name given to any spherical curve where the longitude $\varphi$ and colatitude $\theta$ have the relationship $\varphi=c\theta,\quad c>0$, and the curve of Viviani corresponds to the locus of a geosynchronous orbit, $c=1$.
Is it really true that a polar geosynchronous orbit (displayed in a synodic or rotating frame) is described by Viviani's curve? Can this be demonstrated mathematically?
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Answers to Is an Earth synchronous (?) polar orbit possible? don't mention this,
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but this answer does show some similar-looking curves for geosynchronous orbits that are not polar.
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