Pascal Hilkens Astro Page
Personal blog to promote (solar) astronomy and other related sciences.
Pascal Hilkens Astro Home Page
Pascal Hilkens Astro Home Page
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Solargraphy
Helios Astronomy Club
Sunday, May 26, 2024
Sunspots: what to see?
I used my picture of the huge sunspot AR3664 to point out what to see beyond the umbra and penumbra.
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