Abstract
Abstract. In 2018, the ancient tomb was discovered in Tagawa, Fukuoka. The sizes of the tomb were measured by UAV. The length is 443 m, the diameter is 152 m, and the height is 33 m: the second biggest mound in Japan. Chinese history book, Sanguozhi (Chen, 280) reads Yamatai country occupied 27 countries in Japan in the 3rd century by the queen Himiko. The location of Yamatai was 840 km south from Soul with 70000 families, and the size of Himiko’s tomb was 150 m diameters. The locations of Yamatai country and Himiko’s tomb are still unknown. From Sanguozhi, the optimum location was estimated with the direction, the distance and family numbers. Family numbers were estimated from the river watershed areas. Kyushu islands have 28 big rivers, corresponding to 28 countries described in Sanguozhi. Each river corresponded to each country, and their family number was estimated by 2.5% of the watershed area with family number / 10 a. Finally, the Chikugo river watershed was a candidate of Yamatai country. Moreover, two kinds of tombs became candidates of Himiko’s tomb.
Highlights
In the 3rd century in Japan, 30 countries were recognized by China
These big mounded tombs suggest the relationship with the Japanese emperors, This paper solved uncertain Japanese history in the third century, Yamatai and the queen Himiko locations by the optimization with three parameters, directions, distances, and family numbers each country of Yamatai described in Sanguozhi
(3) Three parameters in Sanguozhi, the direction, distance, and family number, determined Yamatai country location the Chikugo river watershed, and rejected the Yamato river watershed with the optimization of the location
Summary
In the 3rd century in Japan, 30 countries were recognized by China. Yamatai country was a representative of them. The location of this country and Himiko’s tomb was still uncertain. The fundamental reasons were Sanguozhi description (Chen, 280): the location of 8 countries was shown by the directions, the distances, and family numbers. Nobody used the family numbers for the location of each country. If the location of each country was calculated by three parameters: the directions, the distances and the family numbers, the result should be changed. The optimum location was obtained for Yamatai country with RMS. The regression equations were obtained for the construction year estimate These big mounded tombs suggest the relationship with the Japanese emperors, This paper solved uncertain Japanese history in the third century, Yamatai and the queen Himiko locations by the optimization with three parameters, directions, distances, and family numbers each country of Yamatai described in Sanguozhi.
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