Horeki calendar - Horekireki

Japanese: 宝暦暦 - ほうれきれき

A lunar calendar that was in effect from 1754 to 1798. It is also read as "Horyakureki" and is correctly called the Horeki Koju Genreki. At the order of Tokugawa Yoshimune, the eighth Shogun of the Edo Shogunate, Astronomical Staff Nishikawa Masayasu and Shibukawa Noriyasu prepared to revise the Jōkyō calendar, and in 1761, when they were ready to revise the calendar based on Western astronomy, they submitted a petition to Kyoto. However, due to Yoshimune's death, this was not realized. Abe (Tsuchimikado) Yasukuni, head of the Onmyō clan, had Nishimura Toori conduct experiments at the Umekoji Tendai for three years, and completed the "Rekihō Shinsho" (16 volumes), which he submitted to the Emperor on October 16, 1764 (Koju), and came into effect on the 19th of the same year. However, Yasukuni, who wanted to bring real power over the calendar back to Kyoto, only made minor revisions to the Jōkyō calendar, and so shortly after it was enacted, a solar eclipse occurred that was not recorded in the calendar, causing problems, and in 1770, Astronomical Bureau official Sasaki Nagahide and others revised it further. However, because this was a politically motivated calendar reform, it later failed to predict solar eclipses, and was replaced by the Kansei calendar in 10th year of the Kansei era.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

宝暦4 (1754) ～寛政 10 (98) 年施行された太陰暦。「ほうりゃくれき」とも読み，正しくは宝暦甲戌元暦という。江戸幕府8代将軍徳川吉宗の命で，天文方西川正休，渋川則休らが貞享暦改訂の準備を進め，西洋天文学に基づく改暦の準備の整った宝暦1年京都に上表したが，吉宗の死により実現せず，これを陰陽頭 (おんようのかみ) 安倍 (土御門) 泰邦が，西村遠里に梅小路司天台で3年間実験させ，『暦法新書』 (16巻) を大成して，同4 (甲戌) 年 10月 16日上奏し，同 19日施行。しかし，暦道の実権を京都に取戻そうと考えていた泰邦は貞享暦をわずかに修正した程度にとどめたため，施行後まもなく暦に記載されてない日食が起って問題となり，明和7 (70) 年天文方佐々木長秀らがさらに改訂した。しかし政略的な改暦であったため，その後日食の予告に失敗するなどで，寛政 10年次の寛政暦に取って代られた。

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