Tokunai Mogami (1755-1836) explored the northern area of Japan and learned astronomy, surveying and navigation from Toshiaki Honda, a Dutch scholar. He was engaged in the investigation and development of Hokkaido, Kurile Islands and Sakhalin.
Avastatud: 8-10-1999 Avastamiskoht: Nanyo Avastajad: Okuni, T.