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  Publications, Illustrations

  The Changes in the Appearance of a Spot caused by the Rotation of the Sun

  • Fig. 106.

  • Part of Spectrum Analysis in its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies

  • 1872 (Published)

  Here Schellen is illustrating and explaining the phenomenon of sunspots. The accompanying text states: "In Fig. 106 the drawings marked I represent the varying phases through which a spot surrounded by a penumbra…

  • Author Schellen, Heinrich, 1818-1884
  • Subject Sunspots, Astronomy, Sun, Spectrum analysis