Sunspot Drawings by Japanese Official Astronomers in 1749-1750

@article{Hayakawa2018SunspotDB,
  title={Sunspot Drawings by Japanese Official Astronomers in 1749-1750},
  author={H. Hayakawa and Kiyomi Iwahashi and Masashi Fujiyama and Toshiki Kawai and S. Toriumi and H. Hotta and H. Iijima and S. Imada and Harufumi Tamazawa and K. Shibata},
  journal={arXiv: History and Philosophy of Physics},
  year={2018}
}
Sunspot observations with telescopes in 18th century were carried out in Japan as well. One of these sunspot observations is recorded in an account called Sansaizusetsu narabini Kansei irai Jissoku Zusetsu (Charts of Three Worlds and Diagrams of Actual Observations since Kansei Era). We analyze manuscripts of this account to show in total 15 sunspot drawings in 1749-1750. These observations were carried out by contemporary official astronomers in Japan, with telescopes covered by zongurasus… Expand
Revisiting Kunitomo’s Sunspot Drawings During 1835 – 1836 in Japan
Historical sunspot records
Sunspot Positions and Areas from Observations by Thomas Harriot

References

SHOWING 1-10 OF 48 REFERENCES
A Recount of Sunspot Groups on Staudach’s Drawings
Historical sunspot observations: A review
Group Sunspot Numbers: A New Solar Activity Reconstruction
The sunspot observations by Samuel Heinrich Schwabe
Revisiting the Sunspot Number
...
1
2
3
4
5
...