Large scale

Japanese: 大尺 - だいしゃく

〘Noun〙① A unit of length in the Ritsuryo system. The Ritsuryo system divided shaku into large and small shaku, stipulating that the large shaku be used as a geodetic measure, and the rest be small shaku. One small shaku and two sun is equivalent to one large shaku. The large shaku in this Ritsuryo system refers to the Goryeo shaku (komajaku) , which is thought to have existed before the Ritsuryo system, and the small shaku became the large shaku in Wadou. [Ryo Gikai (718)]② A unit of length revised in the 6th year of the Wadou period ( 713 ). The small shaku in the Ritsuryo system was changed to large shaku. The small shaku in the Ritsuryo system, i.e. the large shaku in Wadou, became Tenpyo shaku, which became the origin of the later kanji shaku. However, Tenpyo shaku was slightly shorter than kanji shaku, and is thought to be about 9 sun 8 bu (29.7 centimeters) of the kanji shaku.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① 令制の長さの単位。令では尺を大尺と小尺に二分し、大尺は測地尺として用い、他は小尺を使うと規定した。小尺一尺二寸が大尺一尺に相当する。この令の大尺は、令制以前から存在したとみられる高麗尺(こまじゃく)のことであり、小尺は和銅の大尺となった。〔令義解（718）〕② 和銅六年（七一三）改定された長さの単位。令の小尺を改めて大尺とした。令の小尺すなわち和銅の大尺が天平尺で、のちの曲尺の源流となった。ただし、天平尺は曲尺よりもやや短く、曲尺の九寸八分（二九・七センチメートル）程度とみられる。

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