A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope (1912)
Murphy, Edgar Gardner, 1869-1913 · New York, London, G.P. Putnam's Sons · leaf 80
ires, par M. P. Puiseux,Astron. de IObs., Paris, President de la Societe Astronomiquede France; Ba//e(in de/a 5oc. .4. F., July, I9il,p.303. ^bc Sun 67 brighter, by many times, than any Hght we can create by artificial means. The umbraof a sun-spot, if a very small one, may be 500 or 600 miles in… … FIG. 9. SHOWING DEVELOPMENT OF SPOT AND ROTATION OF SUN From spectrohfliograms made at Ihc Ytrkes Obser,-alury left. Here we have a picture of conditions at a higher level of the Suns atmosphere thanshown on the right, but at the same moment. We note the same spots, but the spectro-heliograph…
Astronomy
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