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[[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 kinetic phenomenon of [[classical mechanics]] which describes the movement of a [[rigid body]] with three distinct [[principal moments of inertia]]. It has also been dubbed the '''Dzhanibekov effect''', after [[Soviet Union|Soviet]] [[cosmonaut]] [[Vladimir Dzhanibekov]], who noticed one of the theorem's [[logical consequence]]s whilst 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] {{Webarchive|url=https://web.archive.org/web/20201113213443/https://oko-planet.su/science/sciencehypothesis/15090-yeffekt-dzhanibekova-gajka-dzhanibekova.html |date=2020-11-13 }}</ref> The effect was known for at least 150 years prior, having been described by [[Louis Poinsot]] in 1834<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> and included in standard physics textbooks such as [[Classical Mechanics (Goldstein)|''Classical Mechanics'']] by [[Herbert Goldstein]] throughout the 20th century.
The theorem describes the following effect: rotation of an object around its first and third [[Moment of inertia#Principal axes|principal axes]] is stable, whereas rotation around its second principal axis (or intermediate axis) is not.
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