Sunset with great sunspots
Taken by Bart Tsang on January 20, 2025 @ Ho Koon Nature Education cum Astronomical Centre, Hong Kong
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A great Sunset with great sunspots. Sunspots at AR3961 was so large that was visible simply wearing a solar viewer without magnification. The "4K" video shot with a Brog100mm f/6.4 ED refractor, 20mm eyepiece and a mobile phone.
Photographer's website:
https://www.youtube.com/watch?v=cy624ERM75Y&ab_channel=HoKoonAstronomy
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