Skip to main content
×
×
Home

Sunspots Areas and Heliographic Positions on the Drawings Made by Galileo Galilei in 1612

  • Mikhail V. Vokhmyanin (a1) and Nadezhda V. Zolotova (a1)
Abstract

In 1612, Galileo Galilei made very accurate drawings of the solar disk. Currently, 47 of them are in the open access: 9 in May 3 – 11, 35 in June and July, and 3 in late August. Unfortunately, reports have not provided the clock time, which results in uncertainty of sunspots heliographic coordinates. In the present study, we determine the exact time of the drawings by comparing the positions of the same spots from day to day. The time of the observations, which varies from 12 to 16 UT, gives us the direction of the solar rotation axis and the position of the helioequator. Unlike the spots drawn by Christopher Scheiner in 1611 – 1612, none of the analyzed spots lies within the helioequator. This confirms the quality of the Galileo’s drawings.

Copyright
References
Hide All
Arlt, R., Senthamizh Pavai, V., Schmiel, C. & Spada, F., 2016, A&A, 595, A104
Casas, R., Vaquero, J. M. & Vazquez, M., 2006, Solar Phys., 234, 379
Galilei, G. 1613, Istoria E dimostrazioni intorno alle macchie solari E loro accidenti comprese in tre lettere scritte all’illvstrissimo signor Marco Velseri . . ., G. Mascadi, Roma
Hoyt, D. V. & Schatten, K. H., 1998, Solar Phys., 179, 189
Sakurai, K., 1980, Journal for the History of Astronomy, 11, 164
Zolotova, N. V. & Ponyavin, D. I., 2016, Solar Phys., 291, 2869
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 7 *
Loading metrics...

Abstract views

Total abstract views: 16 *
Loading metrics...

* Views captured on Cambridge Core between 24th July 2018 - 16th August 2018. This data will be updated every 24 hours.