Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 29
rd ; Yerkes Observatory) 554 189. The Trifid Nebula (Crossley reflector ; Lick Observatory) 555 190. Spiral nebula in Ursa Major (Ritchey ; Yerkes Observatory) . 556 191. Spiral nebula in Andromeda (Crossley reflector; Lick Observ- atory) 657 192. Great nebula in Andromeda (Ritchey ; Yerkes… … A:N^ mTRODUCTIOJN^ TOASTROIN^OMY CHAPTER IPRELIMINARY CONSIDERATIONS 1. Science. — The progress of mankind has been markedby a number of great intellectual movements. At one tiniethe ideas of men were expanding with the knowledge whichthey were obtaining from the voyages of Columbus, Magel-lan, and…
Astronomy
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