The System of the Stars |
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Page xv
... Extent - Analogy with Pleiades - Nebula in Argo - Omega and Trifid Nebula - Diffused Nebulosities PAGE . 268 CHAPTER XIX . THE NATURE AND CHANGES OF NEBULE . Nebula and Comets - Structural Resemblances - Type - Curve of Helical Nebula ...
... Extent - Analogy with Pleiades - Nebula in Argo - Omega and Trifid Nebula - Diffused Nebulosities PAGE . 268 CHAPTER XIX . THE NATURE AND CHANGES OF NEBULE . Nebula and Comets - Structural Resemblances - Type - Curve of Helical Nebula ...
Page 13
... extent , in the grand diurnal procession . Differences in right ascen- sion signify accordingly differences in times of culmination ; and their measures in hours , minutes , and seconds , need only multiplication by fifteen ( the number ...
... extent , in the grand diurnal procession . Differences in right ascen- sion signify accordingly differences in times of culmination ; and their measures in hours , minutes , and seconds , need only multiplication by fifteen ( the number ...
Page 15
... extent with the distances from ourselves of the objects performing them , are barely measurable in a few of the nearest stars . For determinations of these orbital and ' parallactic ' movements such microscopic accuracy is indis ...
... extent with the distances from ourselves of the objects performing them , are barely measurable in a few of the nearest stars . For determinations of these orbital and ' parallactic ' movements such microscopic accuracy is indis ...
Page 32
... extent outweighed by countervailing advantages . Refractors are more manageable than reflectors . They are less sensitive to slight strains , less intolerant of unequal pressures ; they accommodate them- selves better to mechanical ...
... extent outweighed by countervailing advantages . Refractors are more manageable than reflectors . They are less sensitive to slight strains , less intolerant of unequal pressures ; they accommodate them- selves better to mechanical ...
Page 33
... extent , the work has to be done against time . Just as rapid intuitions are necessary for following a long train of mathematical reasoning , because , where the steps are laboured , the wearied faculties at last refuse to continue to ...
... extent , the work has to be done against time . Just as rapid intuitions are necessary for following a long train of mathematical reasoning , because , where the steps are laboured , the wearied faculties at last refuse to continue to ...
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Common terms and phrases
61 Cygni 70 Ophiuchi absorption Aldebaran Algol Andromeda Andromeda nebula appear Arcturus Argûs Astr astronomy atmospheric bands Betelgeux blue bodies bright lines brilliant Cassiopeia Catalogue centre century cluster colour comets condensation Cygni dark detected distance double stars effect extent faint galactic Harvard heavens heliometer hence Huggins hydrogen hydrogen lines Ibid interval less light Lockyer luminous lustre Lyræ magnitude star mass maximum measured ment miles Milky Mira Monthly Notices movements nearly nebula ninth magnitude objects observations Observatory Ophiuchus orbit Orion Orion nebula pair parallax peculiarities period Phil photographic photosphere planetary plates Pleiades present Professor proper motion rays red stars refractor remarkable remote satellite Schjellerup seems sidereal Sir John Herschel Sirian Sirius sixth magnitude small stars solar southern space spectra spectroscopic spectrum stellar Struve sun's telescope tion Trans variable stars velocity visible visual Vogel yellow
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