By George Preoteasa | 2023-12-21
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On 12/21/2023 08:35 am by Patricio Leon | Santiago, Chile
southern hemisphere sunspot AR3529 dominates the Sun face, a Zurich class E spot (10°-15° extent) with a huge nucleus about 3.5 x 3 Earths which is easily seen without optical aid (protected eye)
Newt 4.5" + solar film, 1/500 ISO100
crop, B/C