Tenpō calendar

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The Tenpō calendar (天保暦, Tenpō-reki), officially known as the Tenpō sexagenary unitary calendar (天保壬寅元暦 Tenpō jin'in genreki), was a Japanese lunisolar calendar. It was published in the Tenpō era (1830–1844). It remained in use throughout the late Edo period, from 1844 to 1872.

Excerpt from the Wikipedia article “Tenpō calendar”, under the CC BY-SA 4.0 license. Read the article on Wikipedia