English Sunspots on the surface of the Sun image determination method or standard: SHA-1 described at URL: https://noirlab.edu/public/images/noirlab1902c URL:...
English Sunspots on the surface of the Sun image determination method or standard: SHA-1 described at URL: https://noirlab.edu/public/images/noirlab1902c URL:...
.jpg){kind=link}