A System of Astronomy: On the Principles of CopernicusJ.B. Moore, 1827 - 252 pages |
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Page vii
... elevated regions ; Dr. Herschel's by- pothesis of the sun ; Dr. Brewster's confirmation ; spots on the sun , when and by whom discovered ; the sun's light progressive . SECTION II . 17 25 25 31 The Planets ; the term , planet ...
... elevated regions ; Dr. Herschel's by- pothesis of the sun ; Dr. Brewster's confirmation ; spots on the sun , when and by whom discovered ; the sun's light progressive . SECTION II . 17 25 25 31 The Planets ; the term , planet ...
Page xii
... elevated pole . 172 173 174 175 SECTION II . 177 Longitude ; premiums offered by different nations for the best method of de- termining longitude ; attention of the United States to the subject . CHAPTER XVII . 186 Depression or dip of ...
... elevated pole . 172 173 174 175 SECTION II . 177 Longitude ; premiums offered by different nations for the best method of de- termining longitude ; attention of the United States to the subject . CHAPTER XVII . 186 Depression or dip of ...
Page 18
... elevated . Depression of a heavenly body below the horizon , is an arch of a vertical circle , intercepted between the body and the horizon . Disk of a planet or the sun is the hemisphere presented to a spectator , appearing like a ...
... elevated . Depression of a heavenly body below the horizon , is an arch of a vertical circle , intercepted between the body and the horizon . Disk of a planet or the sun is the hemisphere presented to a spectator , appearing like a ...
Page 27
... elevated observer on the top of Chimborazo or Him- maleh , is retired , at least in some measure , from the influ- ence of the earth , and of the bodies on its surface . He must exhaust his own treasure of heat , while , except ...
... elevated observer on the top of Chimborazo or Him- maleh , is retired , at least in some measure , from the influ- ence of the earth , and of the bodies on its surface . He must exhaust his own treasure of heat , while , except ...
Page 28
... elevated ones , the disk of the sun has a mottled appearance . Indentations are the depressed or low parts of the corruga- tions ; they also extend over the whole surface of the lumin- ous solar clouds . Pores are very small holes or ...
... elevated ones , the disk of the sun has a mottled appearance . Indentations are the depressed or low parts of the corruga- tions ; they also extend over the whole surface of the lumin- ous solar clouds . Pores are very small holes or ...
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Common terms and phrases
altitude angle aphelion appear Aries ascending node astronomers atmosphere axis bissextile calculated celestial centre comets conjunction constellation dark shadow declination degree diameter disk diurnal motion diurnal rotation divided dominical letter earth earth's shadow eclipse Epact equal equator equinox fast of clock full moon heavenly body heavens Herschel horary motion horizon hour inferior conjunction Jupiter latitude light longitude and anomaly luminous lunar lunation March Mars mean anomalies mean distance Mercury meridian miles minutes month moon's orbit obliquity observed opposite parallax parallel passing penumbra perihelion planet polar circles pole Proportional Logarithms radius reckoned refraction Retrograde motion revolution right ascension rising round the sun satellites Saturn seen semi-diameter side sidereal slow of clock solar solstice subtract Sun fast Sun slow sun's anomaly sun's mean sun's place surface tides tion transit tropic true Turn the globe Venus visible zenith
Popular passages
Page 200 - Rectify the globe to the latitude of the place; bring the sun's place in the ecliptic to the meridian, and set the index to XII.
Page ii - BBOWN, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : " Sertorius : or, the Roman Patriot.
Page 177 - Observer' at a salary of 100£ per annum, his duty being 'forthwith to apply himself with the most exact care and diligence to the rectifying the tables of the motions of the heavens and the places of the fixed stars, so as to find out the so much desired longitude of places for the perfecting the art of navigation.
Page iv - ... constitution of the universe by the means of these buildings and of observers stationed in them, shall we doubt of their usefulness to every nation? And while scarcely a year passes over our heads without bringing some new astronomical discovery to light, which we must fain receive at...
Page 179 - ... that, situated as we are in this Western hemisphere, more than three thousand miles from any fixed or known meridian, it would be proper, in a national point of view, to establish a first meridian for ourselves ; and that measures should be taken for the eventual establishment of such a meridian in the United States. In examining the maps and charts of the United States, and the particular States, or their...
Page 160 - The atmosphere is known to abound with electric matter, and the appearance of the electric matter in vacuo is exactly like the appearance of the aurora borealis, which, from its great altitude, may be considered to be in as perfect a vacuum as we can make. The electric matter in vacuo suffers the rays of light to pass through, without being affected by them. The tail of a comet does not expand itself sideways, nor does the electric matter. Hence, he supposes the tails of comets, the aurora borealis,...
Page 162 - ... aperture; and, at another time, in 41 minutes, he saw 258,000 stars pass through the field of his telescope. Every improvement in his...
Page 179 - Junonia, one of these islands, supposed to be the present island of Teneriffe. " The Arabians, it is said, fixed their firs,t meridian at the most westerly part of the continent of Africa. In the fifteenth and sixteenth centuries, when Europe was emerging from the dark ages, and a...
Page 66 - There is not, perhaps," said this great and sound astronomer, " another object in the heavens that presents us with such a variety of extraordinary phenomena as the planet Saturn ; a magnificent globe encompassed by a stupendous double ring ; attended by seven satellites; ornamented with equatorial belts; compressed at the poles ; turning on its axis ; mutually eclipsing its rings and satellites, and eclipsed by them ; the most distant of the rings also turning on its axis, and the same taking place...
Page 138 - A month in law is a lunar month, or twenty-eight days, unless otherwise expressed ; not only because it is always one uniform period, but because it falls naturally into a quarterly division by weeks. Therefore a lease for