He was also well-versed with the study of the calendar, and together with Takebe, he appealed to Shogun Yoshimune TOKUGAWA the need to import western books on astronomy translated into Chinese.
また、暦学に詳しく、建部とともに吉宗に西洋暦法の導入、漢訳西洋天文学書の輸入の必要性を訴えた。