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Mysterious unit used in Japanese language in the age of gods

Base data: length.
There are various stories such as it is the length from the bottom of the palm to the tip of the middle finger

Based on hand size but not an exact measurement

Uniquely Japanese units that came before those from China, such as the shaku, make an appearance in Kojiki (Records of Ancient Matters) and Nihon Shoki (Chronicles of Japan). One of those, the ata unit, is based on the size of the hand. Unfortunately, we do not know the exact length. The “yata” in “yata-garasu”, the sacred crow who guided Emperor Jinmu refers to the length of 8 ata.