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[[File:tennis_racquet_principal_axes.svg|thumb|Principal axes of a tennis racket.]]
[[File:tennis_racket_theorem.ogv|thumb|upright=1.5|Composite video of a tennis racquet rotated around the three axes – the intermediate one flips from the light edge to the dark edge]]
[[File:Théorie Nouvelle de la Rotation des Corps.jpg|thumb|Title page of "Théorie Nouvelle de la Rotation des Corps", 1852 printing]]
The '''tennis racket theorem''' or '''intermediate axis theorem''' is a result in [[classical mechanics]] describing the movement of a [[rigid body]] with three distinct [[principal moments of inertia]]. It is also dubbed the '''Dzhanibekov effect''', after [[Soviet Union|Soviet]] [[cosmonaut]] [[Vladimir Dzhanibekov]] who noticed one of the theorem's [[logical consequence]]s while in space in 1985<ref>[http://oko-planet.su/science/sciencehypothesis/15090-yeffekt-dzhanibekova-gajka-dzhanibekova.html Эффект Джанибекова (гайка Джанибекова)], 23 July 2009 {{in lang|ru}}. The software can be downloaded [http://live.cnews.ru/forum/index.php?s=5091d296ac0d22ad6b6e9712f3b0edbe&act=Attach&type=post&id=87112 from here]</ref> although the effect was already known for at least 150 years before that.<ref>Poinsot (1834) [https://archive.org/details/thorienouvelled00poingoog/page/n9 ''Theorie Nouvelle de la Rotation des Corps''], Bachelier, Paris</ref><ref>{{cite av media|publisher = Veritasium | title = The Bizarre Behavior of Rotating Bodies, Explained | date = September 19, 2019 | url = https://www.youtube.com/watch?v=1VPfZ_XzisU | access-date = February 16, 2020 | people = [[Derek Muller]]}}</ref>
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