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He pointed out some of its errors in a memorial addressed to the Bakufu under the sway of the fourth shogun, but the then prime minister, Sakai Tadakiyo, paid no attention to the document. Shunkai, however, did not desist. In 1683, an eclipse of the moon took place, and he demonstrated that it was erroneously calculated in the Chinese calendar.
The credit of this achievement belongs to a mathematician called Shibukawa Shunkai. A profound student, his researches had convinced him that the Hsuan-ming calendar, borrowed originally from China and used in Japan ever since the year A.D. 861, was defective.
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