What it does
This is a secret taijutsu of the Hyūga clan's main house, traditionally only known by the head of the clan and the clan's heir. Neji Hyūga, a member of a branch house, was able to learn this technique through mere observation, a testament to his genius. The moment before the Hyūga is struck by an attack, they emit chakra from all of their body's tenketsu to block it. They then spin rapidly, repelling the attack (and anything else in the vicinity) away and creating a protective shield for as long as they continue to spin. The greater the force of an attack, the greater the force with which it's repelled. The user is capable of defending not only themselves but multiple people.
Revolving Heaven is meant to compensate for the blindspot of the Hyūga's Byakugan. But in this regard it is quite effective, leading Tenten to describe it as an absolute defence superior to the Shield of Sand. The only effective means of countering the Revolving Heaven is to prevent the Hyūga from spinning; the anime sometimes depicts it being used without spinning.
Description
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Kaiten (回天, lit meaning=revolving heaven) is a term used to refer to turning the tides or fighting back up from a weak position. When written as 回転 (, kaiten), it means "revolving" or "spinning".
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In the anime, Revolving Heaven is shown to reach speeds of at least about 1200 km/h (745.6 mph). If an opponent can exceed this speed in the direction of the rotation, they can breach the defence.
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In the anime, if the user does not have focus and precise chakra control when the Revolving Heaven is executed, the user will repel themselves out of the technique.
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In the anime, the Genjutsu World's Hinata Hyūga can use this technique.
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The trading card game Naruto Kayou by Studio Pierrot classifies this technique as B-Rank.