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Shaku (unit)

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A shaku is a special way to measure length in Japan. It is a unit used to describe how long something is. This unit comes from an old Chinese system. Long ago, people measured it using a human hand. They looked at the space from the thumb tip to the finger tip.

Measuring things can work in many different ways. The shaku is divided into smaller pieces to be very exact. One shaku is made of ten smaller units called sun. You can go even smaller by using bu. Ten of those bu units make up one sun. This system helps people measure things with great care.

History shows that the shaku was not always the same. In the past, the length changed depending on the place or use. One version was used by tailors to measure cloth. They called this the baleen shaku because they used whale whiskers as rulers. There was also a longer version known as the kinsaku. By the early 1800s, most shaku were between 29 and 31 centimeters.

Today, the shaku has a very specific size set by law. Since 1891, the Meiji government has used a standard length. One shaku is now exactly 10/33 of a meter. This is about 30.3 centimeters long. You can fit about 3.3 shaku into one single meter. Even though official use was banned in 1966, people still use it.

Many things in Japan still use this measurement. Traditional carpenters use it to build wooden structures. It is also used to make beautiful kimono clothing. A bamboo flute called the shakuhachi gets its name from this unit. The name tells us the flute is one shaku and eight sun long. The unit even helps define the modern Taiwanese foot.

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