He was famous for his books about astronomy and geography, and studied mainly Chinese astronomy while deeply understanding the features of European astronomy; and in 1718 he went to Edo, in 1719 he answered the inquiries on astronomy from Shogun Yoshimune TOKUGAWA; after that, he stayed for some time in Edo and returned to Nagasaki.
天文・地理学上の著述で有名、ヨーロッパ天文学説の特徴を十分承知しながら、中国天文学説を主とし、享保3年（1718年）に江戸に下り、翌享保4年（1719年）に徳川吉宗から天文に関する下問を受けた後暫く江戸に滞在し、長崎に帰った。