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Joken published one of his most famous works on peoples and places of the world, ''[[Kai tsusho ko|Ka'i tsûshô kô]]'', in [[1695]]. This original version was in two volumes, and described the lands of China, Korea, Ryukyu, Taiwan, Southeast Asia, and Europe, and their peoples. In [[1709]], Joken published an expanded version, ''Zôho ka'i tsûshô kô'', covering the same subjects in five volumes.

Joken published one of his most famous works on peoples and places of the world, ''[[Kai tsusho ko|Ka'i tsûshô kô]]'', in [[1695]]. This original version was in two volumes, and described the lands of China, Korea, Ryukyu, Taiwan, Southeast Asia, and Europe, and their peoples. In [[1709]], Joken published an expanded version, ''Zôho ka'i tsûshô kô'', covering the same subjects in five volumes.

Though Joken never achieved the position of ''[[tenmongata]]'' (astronomy/calendrics official for the [[Tokugawa shogunate]]), his son [[Nishikawa Seikyu|Nishikawa Seikyû]] ([[1693]]-[[1756]])<!--西川正休--> did.

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. 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.

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