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Japanese Astronomical Chart. Tr. by Shiba Kokan. Toto: Shunparo, 1808. Shiba Kokan was also interested in astronomy and introduced the heliocentric theory of Nicolaus Copernicus (1473-1543). The Copernican theory was first introduced to Japan by Motoki Ryoei, but Motoki's Tenchi nikyu yoho and similar works were not published and were only circulated as transcriptions.