The Taiyō-ken (Fist of the Sun), known as the Solar Flare in the English dub, is a fighting technique in Dragon Ball series.
History and usage
A good few people had shown the ability to use this technique during the series, but not as many as were able to use the Kamehameha. The technique is performed by the user flying in front of the sun and placing their hands close to the center of their face with the fingers spread toward their eyes. The user then calls out the name and a blinding blue light fires out that blinds everything watching except the user, since they are projecting the light. Because this is simply a flash of light, it will work despite any gap in power between the user and the target. This technique is defensive rather than offensive, and is mainly used as way to gain the upper hand or in order to make hasty retreat. Because of the nature of the attack, it has almost always been extremely effective. The technique is rendered useless if opponent is wearing sunglasses or if they close their eyes. The technique was first used by Tien and later on by Goku, Krillin, and Cell.
Goku used it on Great Ape Vegeta in order to buy time to collect energy for the Spirit Bomb. During the fight on Namek, Krillin used it to blind Dodoria who was chasing him, after he and Gohan had rescued Dende. Krillin performed his a little differently when he used it on Dodoria, however it still produce the desired result. Krillin later used it again against 2nd Form Frieza.
After the Frieza Saga, it is used several times by Cell to escape the Z Fighters and helps him in his mission to absorb #17 and #18.
All the forms of Buu (with the exception of the reincarnated Uub) after the fat one may be immune to this, because of their eyes, which is supported by Kid Buu being the only one to blink, which only happened when he was about to die.