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File:The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific (1919) (14782613194).jpg

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Identifier: adolfostahllectu00astruoft (find matches)
Title: The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific
Year: 1919 (1910s)
Authors: Astronomical Society of the Pacific Aitken, Robert Grant, 1864-1951
Subjects: Astronomy
Publisher: San Francisco Stanford University Press
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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lerinan 148 XXXIX. Combined Photographs of Prominences and Floc- cuLi, Mount IVilson Observatory 151 XL. Hydrogen Flocculus Drawn Into Sun-Spot, Mount IVilson Observatory Photographs 154 XLT. The Great Nebula in Orion, Photograph by J. E. Keeler 157 XLII. Dark Lanes in Tavrus, Photograph by E. E. Barnard 161XLIII. Curved N^ebula Above Orion, Drawing and Photo-graph by E. E. Barnard 164 XLIV. The Pleiades, Photograpli by Isaac Roberts 166 XLV. Dark Nebulae in Orion and in Sagittarius, Photo-graphs by H. I). Curtis 168 XLVI. Great Nebula in Andromeda, Showing Novae, 60-Inch Reflector Photograph 172 XLVII. Lights in Valley Below Mount Wii^son, Photograpli by F. Ellernian 208 XLVIII. Kapteyn Selected Are.v No. 40, 60-Inch Reflector Photograph 224 XLIX. Region of 0 Ophiuchi, Photograph by E. E. Barnard.. 232L. The 100-Inch )\Iirror 246 LI. Tube-Section of 100-Inch Reflector on the Road up Mount Wilson 251 Lll. Mounting of THE 100-Inch Reflector 253 LIII. Dome for the 100-Inch Reflector 254
Text Appearing After Image:
c ^ be i~-) ^ •■ij •t; -c^ to ^ THE SOLAR SYSTEM By W. W. Campbell The study of astronomy l:)ei;ins naturally with the solarsystem. The solar system is our abode. It is the observingstation from which we look out in all directions to the greatstellar system. The solar system is only a minute detail inthe structure of the universe. He who, would explore theuniverse should begin by knowing his immediate surround-ings. Our visual telescopes could show us sixty or seventymillions of stars, distributed over the whole sky, and our greatreflecting telescopes could photograph possibly two or threetimes as many. With only one exception all of these stars areso far away that they are seen as mere points of light in ourmost powerful telescope, even when the magnification is nearly3.000 diameters. The one exceptional star is our Sun. It aloneof all the stars can be seen to have a diameter. It alone ofall the stars can be studied in any geometric detail by meansnow available. This is because

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