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  • Timeline for How a sunspot number is calculated by an individual observ

    From a a@21:1/5 to All on Fri Nov 4 12:22:37 2022
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    Timeline for How a sunspot number is calculated by an individual observer?

    https://astronomy.stackexchange.com/posts/50939/timeline

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  • From a a@21:1/5 to a a on Sun Nov 6 07:01:04 2022
    On Friday, 4 November 2022 at 20:22:39 UTC+1, a a wrote:
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    Timeline for How a sunspot number is calculated by an individual observer?

    https://astronomy.stackexchange.com/posts/50939/timeline
    Can you count number of sunspots ( black spots) in this solar disc video from Japan ?

    https://swc.nict.go.jp/data/latest/sdo/latest_512_HMIIF.mp4

    My count says: 5 sunspots
    they claim about 50 sunspots

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