Changes

In [[1719]], the shogunate summoned Joken to [[Edo]] to consult him on astronomical matters. The following year, [[Nagasaki interpreters|Nagasaki-based Chinese-language interpreter]] [[Ro Sosetsu|Ro Sôsetsu]] was also summoned to Edo and the two began to work together. After his return to Nagasaki, Joken was asked to produce copies of his writings on astronomy and geography for presentation to the shogun.

In [[1719]], the shogunate summoned Joken to [[Edo]] to consult him on astronomical matters. The following year, [[Nagasaki interpreters|Nagasaki-based Chinese-language interpreter]] [[Ro Sosetsu|Ro Sôsetsu]] was also summoned to Edo and the two began to work together. After his return to Nagasaki, Joken was asked to produce copies of his writings on astronomy and geography for presentation to the shogun.

Though Joken was never officially named to the position of ''[[tenmongata]]'' (astronomy/calendrics official for the [[Tokugawa shogunate]]), his son [[Nishikawa Seikyu|Nishikawa Seikyû]] ([[1693]]-[[1756]])<!--西川正休--> later was. Seikyû is not known to have produced much original works, but edited or recompiled a number of Joken's works. Joken's daughter, meanwhile, married a son of Chinese interpreter [[Sakaki Soken]] (d. [[1740]])<!--彭城素軒-->, who had written the preface to several of Joken's books.

Though Joken was never officially named to the position of ''[[tenmongata]]'' (astronomy/calendrics official for the [[Tokugawa shogunate]]), his son [[Nishikawa Seikyu|Nishikawa Seikyû]] ([[1693]]-[[1756]])<!--西川正休--> later was. Seikyû is not known to have produced much original works, but edited or recompiled a number of Joken's works, including ''Nagasaki yawa gusa'' ([[1731]]), a text on Nagasaki, its history, and its connections with the Portuguese and the Dutch. Joken's daughter, meanwhile, married a son of Chinese interpreter [[Sakaki Soken]] (d. [[1740]])<!--彭城素軒-->, who had written the preface to several of Joken's books.

==Selected List of Works==

==Selected List of Works==

*''Gusho rekishô zokkai'' ("Explanations in Vernacular Language of Calendrical Matters in the Book of Yu")

*''Gusho rekishô zokkai'' ("Explanations in Vernacular Language of Calendrical Matters in the Book of Yu")

*''Kaii bendan'' ("Discussions of Strange Things")

*''Kaii bendan'' ("Discussions of Strange Things")

*''Ryôgi shûsetsu'' ("Collected Theories on Two Models")

*''Ryôgi shûsetsu'' ("Collected Theories on Two Models")

*''Shichiyô usen benron'' (a work on whether the visible planets, sun, and moon, move in the same direction as the Heavens, or in the opposite direction)

*''Shichiyô usen benron'' (a work on whether the visible planets, sun, and moon, move in the same direction as the Heavens, or in the opposite direction)