Solar Observing Guide.
The AAVSO Solar Observing Guide
Download Version 1.0 - April 2017 (1.8 MB)
https://www.aavso.org/sites/default/files/publications_files/solar_guide/SolarObservingGuide.pdf
The main activity of the AAVSO Solar Section is the monitoring and recording of sunspots from which the American Relative Sunspot Numbers (RA) are computed. The AAVSO Solar Observing Guide explains exactly how this can be done in a safe and effective manner. Reading this Guide is essential for anyone interested in pursuing this fun, fascinating, and useful work.
Source : https://www.aavso.org/solar-observing-guide
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