Sunspot uncertainty. Bob Zimmerman, BehindtheBlack.com

Feb 05, 2022, 01:14 AM

Photo:   Trouvelot - Group of sun spots - 1875
              Group of sun spots and veiled spots. Observed on June 17th 1875 at 7 h. 30 m. A.M. (Plate I from The Trouvelot Astronomical Drawings 1881)

Sunspot uncertainty. Bob Zimmerman, BehindtheBlack.com

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