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CHALLENGE !! Can you count a number of sunspots on the attached image of solar disc ?
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Nov 3, 2022, 1:57:17 PM
11/3/22
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Can you count a number of sunspots on the attached image of solar disc ?
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18:45 (8 minutes ago)
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swc.nict.go.jp/en/trend/sunspot.html
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