Spreadsheet
Michel Collart has prepared an Excel spreadsheet to give the size of the solar disk for various focal lengths, comparative Earth sizes etc.
Solar_Spreadsheet.zip
Grids
http://bass2000.obspm.fr/ephem.php
http://solar-center.stanford.edu/solar- ... tlong.html
http://www.atoptics.co.uk/tiltdld.htm
Current Solar Data
http://raben.com/maps/index.html
http://www.nso.edu/current_images.html
http://sohowww.nascom.nasa.gov/data/realtime/
http://www.solobskh.ac.at/index.php
http://www.solarmonitor.org/
http://www.bbso.njit.edu/Research/FDHA/ha_1min.html
http://www.spaceweather.com/
http://www.solen.info/solar/
http://solardatabase.free.fr/sol.php
Solar data and grid overlays
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Solar data and grid overlays
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer