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The Chou-tei and Shinn-Yuu Years

Until 1868, when Japan having been governed by the Tokugawa shogunate transformed itself from a feudal state to a modern nation-state with the Meiji Restoration, the Chou-tei, which had sill remained in Kyoto simply as the sacred traditional authority apart from the political power in Edo, had changed the name of the era every Shinn-yuu years in order to prevent foretold revolutionary disasters.

The Composition of Surplus & Minus 120 Years in the Chronicles of Japan

In The Truth of the Chronicles of Japan, Yuuko Kuranishi insists that the plural year number tables included in the chronicle, which look superficially a single year number, was assembled in order that both of surplus and minus years are just 120 years intentionally by the editor. The number 120 seems to be related to the sixty ageary cycle.

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The Origin of the Sixty Agenary Cycle

Some scholars infer that the method of the sixty agenary cycle, which has been regarded as a traditional Chinese calendar, should have been introduced from the ancient civilization of Mesopotamia. Particularly, Sumerians are said to have used and developed the sixty decimal.

The Explanation of Yuki-tura Miyoshi

Yuki-tura Miyoshi, who was a famous scholar and a jurisconsult called Myou-bou-ka in the age of Heian, said that “Shin-i Reki-un Setu” with six-agenary cycle was introduced into Japan with import of the text book explaining the divination theory, Eki-I, written during the dynasty of the Former Han. To our regret, it is nearly impossible to verify his assertion, because Eki-I has lost nowadays both in China and Japan.

The Sinn-Yuu and the Regnal Year of Jimmu-Tennow

“Shin-i Reki-un Setu” is a theory giving meaning to each of every sixty years. For instance, according to this theory, the regnal year of the first Sumera-mikoto, Jimmu-Tennow, falls on that of Shinn-Yuu when some revolutionary events would be supposed to occur.

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Shinn-I-Reki-Unn-Setu in the Chronicles of Japan

The reason why the editors of the Chronicles of Japan arranged the composition of the year numbers is supposed that they should have hoped to enjoy the benefits of the theory called “Shin-i Reki-un Setu” in Japanese.