Hangetsu
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Hangetsu (半月) (Japanese: "Half Moon") is an advanced kata practiced in Shotokan karate. It originates from the Naha-te school. The first part is executed slowly with strong breathing, stressing the development of the hara. This sequence shares a strong similarity with sanchin. The second part of the kata is more dynamic in its execution. Due to the shared principles of expansion and contraction, Gichin Funakoshi substituted hangetsu for sanchin in the Shotokan curriculum. Mastery of this kata rests on mastery of hangetsu-dachi (half-moon stance). The kata consists of 41 movements. The older Okinawan version of this kata is known as Seisan.