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Why do days of the week in Japanese (Sun, Moon, and Five Planets) exactly match Latin-based calendars?

The division of days into seven day weeks is relatively recent historically. I think in the past the Japanese used 10 day periods, called decameron in English or more easily 旬. So, the Japanese must ...
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Origin of ~なければ ならない

なければならない is a double negation - something found in many languages. In Old Japanese, there were -ざるべからず and -ねばならぬ. It looks like the Japanese expressions have to do with 不可不… in Chinese. I don't know ...

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