Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 49
venience,or without the necessity for any protection to the eye, anda number of young astronomers can all view the sun at thesame moment. On such a picture you will generally see D 34 Star-Land. the brilliant surface marked with dark spots, which aresometimes as numerous as shown in Fig. 13. When… … Fig. 14.—A Sun-spot. (After Langley. of intensely heated vapours. We might almost say thatthe spots are holes, by which we can look through thebrilliant surface to the interior and darker parts. Some-times the spots close up, and fresh ones will open else-where. Sometimes the whole surface is…
Astronomy
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