Ajima Naonobu

  • Shigeru Jochi
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4425-0_8421

Ajima Naonobu (1739–1796), also called Ajima Chokuen, was born at Edo (now Tokyo) in 1732. Ajima's father was eighty Pyo1 and a samurai warrior of Lord Shinjo, 2 in Dewa (now Yamagata prefecture). Ajima studied mathematics first under IRIE Masataka, a mathematician of the Nakanishi‐ryu school, then under YAMAJI Nushizumi (also called Yamaji Shuji 1704–1772), who was the third president of the Seki‐ryu school and an astronomer at Bakufu Temmongata (Shogun'sAstronomical Observatory). Then Ajima became an accountant of Lord Shinjo, at the rank of 100 Koku.

Yamaji made the Horeki (Kojutsu) Reki calendar (Calendar Made in Horeki Era 1754), which was used from 1755 to 1797; however, this calendar was not very accurate. In order to make a new luni‐solar calendar, in 1762 he started to observe the sky with FUJITA Sadasuke (1734–1807), his assistant. When Fujita was appointed Sangaku Shihan(Professor of Mathematics) of Lord Arima (1714–1783) in 1768, he retired from the Shogun's Observatory....

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References

  1. Akira, Hirayama and Matsuoka Motohisa eds. Ajima Naonobu Zenshu. Tokyo: Fuji Junior College Press, 1966.Google Scholar
  2. Gakushuin, Nihon ed. (Fujiwara Matsusaburo). Meiji‐zen Nihon Sugaku‐shi. Tokyo: Iwanami Shoten, 1954.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg New York 2008

Authors and Affiliations

  • Shigeru Jochi

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