A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 196
, ,j j . > ^, t i _ _ - Fig. 95. The Great Sun Spot of September, 1870, and the Structure of the Photosphere. From a Drawingby Professor Langley. From The New Astronomy, by permission of the Publishers. though of irregular form; but here and there, especially in theneighborhood of the spots,…
Astronomy
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