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伊能忠敬(2)、日本の偉人 Tadataka Inoh, a great figure in Japan

As may as about 200 years ago, his accomplishment of making the first precise map of Japan (picture) was made from 1800 to 1816 at his age of 55 to 71 years old after his retirement. It is also a great surprise that he calculated the the circumference of the earth, whose error is less than thousandth part compared with that of the current figures of 40,077 km.