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Key terms: sunspot solar cycle observed spots alt filter showing activity flux flare visible telescope rotation polar variation viewing aurora sunset photosphere graph galileo maunder solar cycle cyclic magnetic field phenomena projected sunspot activity stellar sunspot numbers eyepiece spectral fabricius astronomy dark spots hemisphere indirectly convection solar constant astronomers observatory solar telescope mancha solar sunspot index space weather sunspot cycle solar rotation number of sunspots sunspots were rarely observed Search external links cited by footnotes on Wikipedia page Sunspot: |
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