About the SPA
Join or renew
SPA observing sections
1. All about the Sun
2. Looking at the Sun safely
3. Which telescope is best for solar?
4. What are hydrogen alpha and calcium filters?
5. Making a solar observation
6. Counting and recording activity for the SPA
7. Imaging the Sun – the basics
8. Imaging the Sun – using webcams
9. Solar eclipses
10. Solar history (a brief guide)
Top 32 largest sunspots
Useful websites and books
Graphs and Forms
24th May 2019
The Sun is once again spotless.