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Created On: 2011
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The story is based on the actual astronomer and calender-reformer Shibukawa Harumi (1639-1715). In Harumi's time, the Japanese used the Chinese lunar-solar Xuan-ming calendar, which had not been updated in nearly 800 years. At that point, there was already a two-day delay in the winter solstice. He reformed the calendar based on his careful astronomical observations. [tethysdust]