Yuántōng 圓通
Late-Jīn / early-Yuán lay Buddhist; interlocutor-questioner in the Chán Q&A collection Tōng xuán bǎi wèn 通玄百問 KR6q0258, posing 100 questions to Wànsōng Xíngxiù 萬松行秀. Lifedates and full biographical details unrecorded.
name: 圓通 pinyinName: Yuántōng alternateNames: [円通, Entsū, Fumon Entsū, 普門圓通] dynasty: 日本 birthDate: 1754 deathDate: 1834 cbdbId: dilaAuthorityId: created: 2026-04-26 updated: 2026-04-26
Yuántōng 圓通 (Japanese: Entsū 円通)
Late-Tokugawa-period Japanese Tendai 天台 Buddhist monk-scholar; full Dharma-name Pǔmén Yuántōng 普門圓通 / Fumon Entsū. Born Tokugawa-period 1754; died 1834.
A scholar-monk of the Tendai temple network, Yuántōng devoted his life to the Bukkoku-rekishō-hen 佛國暦象編 (KR3f0057 Fóguó lìxiàng biān) — a 5-juan Buddhist-cosmographic critique of European astronomy. The work defends the traditional Buddhist Mount Sumeru (Xūmí 須彌, Shumi-sen) cosmology against the encroaching Copernican-and-post-Copernican European astronomical doctrines that had reached Japan via Dutch rangaku 蘭學 (Dutch-learning) in the 18th century.
The work’s polemical position: the European doctrines of (a) the round Earth, (b) the heliocentric universe, (c) the planetary orbits computed by Western mathematics, are fang-lán (Holland) heretical innovations contradicting the Buddha’s own cosmographic teaching. Yuántōng’s preface specifically critiques the doctrine that “the great Earth is one great round sphere” (dàdì wéi yī dàyuánqiú 大地為一大圓球), arguing that this contradicts Buddhist cosmology and ignores the xīmí sānlún (Sumeru three-wheels: wind-wheel, water-wheel, gold-wheel) on which the Earth-disc rests in Buddhist cosmography.
The work circulated in Japanese Tokugawa Buddhist circles and represents the most ambitious Japanese-Buddhist anti-Western-astronomy treatise of its period. Its inclusion in the Kanripo corpus (under KR3f, Tiānwén suànfǎ) is unusual — most Kanripo entries in this division are Chinese works. The Japanese-Buddhist provenance and the Tokufū 德風 / Tōei-daiō-fu 東叡大王府 collection-stamp on the source recension reflect the corpus’s historical inclusiveness of East-Asian-Buddhist astronomical material.