The Scientific Library; Or, Repository of Useful and Polite Literature: Comprising Astronomy, Geography, Mythology, Ancient History, Modern History, and Chronology ...S. Wood & Sons, 1818 |
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Page 16
... according to their respective appearances , we cannot venture to assert that they are not all of equal magnitude Dr Herschel , whose laborious investigations are entitled to the warmest applause , has dis covered that the galaxy , or ...
... according to their respective appearances , we cannot venture to assert that they are not all of equal magnitude Dr Herschel , whose laborious investigations are entitled to the warmest applause , has dis covered that the galaxy , or ...
Page 34
... ( according to this computation ) by 11 minutes , and 11 seconds , which in 150 years would have amounted to one diurnal rotation of the earth , and in the space of 17,450 years , would have occasioned a com . plete 34 ASTRONOMY .
... ( according to this computation ) by 11 minutes , and 11 seconds , which in 150 years would have amounted to one diurnal rotation of the earth , and in the space of 17,450 years , would have occasioned a com . plete 34 ASTRONOMY .
Page 47
... according to its remoteness from , or proximity to , the equator . And to ascertain this distance , we suppose & meridian to be drawn through the given place , and by counting the degrees of that circle con- tained between this point ...
... according to its remoteness from , or proximity to , the equator . And to ascertain this distance , we suppose & meridian to be drawn through the given place , and by counting the degrees of that circle con- tained between this point ...
Page 52
... according as it is situated in the eastern or the western hem- isphere ; and so of any other given place . It is also particularly worthy of remark , that the greatest possible longitude of a place is 180 degrees ; and that the ...
... according as it is situated in the eastern or the western hem- isphere ; and so of any other given place . It is also particularly worthy of remark , that the greatest possible longitude of a place is 180 degrees ; and that the ...
Page 54
... according to the difference of longitude . Now the times of these appearances are cal culated according to a certain meridian , and these calculations are given in an almanack or ephemeris ; so that by attending to the time of the ...
... according to the difference of longitude . Now the times of these appearances are cal culated according to a certain meridian , and these calculations are given in an almanack or ephemeris ; so that by attending to the time of the ...
Common terms and phrases
aberration of light altitude annual revolution apparent motion appear Aries ascer ascertain astronomers called cause celestial centre circle comets computed consequently course darkness days and nights degree 15 degree 30 diameter discovered distance diurnal motion diurnal rotation divide Dominical letter earth earth's shadow east eastern side epact equa equal equator equinoctial equinox exactly extends from degree fixed stars full moon golden number gree half happen heavenly bodies heavens horizon isphere Julius Cæsar latitude less Libra light longitude luminary lunar lunar eclipses magni millions of miles minutes month moon's orbit nodes noon north or south north pole northern occasioned opposite parallel passes between degree phere planets Principal star quadrant Rectify the globe refraction satellites seasons second magnitude shadow falls situated solar eclipse south pole southern hemis southern hemisphere southern side sun and moon sun-dial sun's place supposed tides time-piece tion tude turn twelve western young readers
Popular passages
Page 13 - Amid the radiant orbs, That more than deck, that animate the sky, The life-infusing suns of other worlds ; Lo ! from the dread immensity of space Returning, with accelerated course, The rushing comet to the Sun descends ; And as he sinks below the shading earth, With awful train projected o'er the Heavens, The guilty nations tremble.
Page 100 - For I perceived that, if Light was propagated in Time, the apparent Place of a fixed Object would not be the same when ' the Eye is at Rest, as when it is moving in any other Direction, than that of the Line passing through the Eye and the Object ; and that, when the Eye is moving in different Directions, the apparent Place of the Object would be different.
Page 99 - March, 1726, the star was found to be 20" more southwardly than at the time of the first observation. It now, indeed, seemed to have arrived at its utmost limit southward, because, in several trials made about this time, no sensible difference was observed in its situation. By the middle of April it appeared to be returning back again towards the north ; and about the beginning of June it passed at the same distance from the zenith as it had done in December when it was first observed. From the quick...
Page 100 - For I perceived that, if light was propagated in time, the apparent place of a fixed object would not be the same when the eye is at rest, as when it is moving in any other direction than that of the line passing through the eye and...
Page 79 - Eclipses of the sun are more frequent than those of the moon, because his ecliptic limits are greater ; and yet we have more visible eclipses of the moon than of the sun, which is owing to their being seen from all parts of the earth where the moon is above the horizon when the eclipse happens ; whilst those of the sun can only be observed on that small portion of the hemisphere, on which the moon's shadow falls. The greatest number of eclipses, of both luminaries, which can happen in a year, is...
Page 99 - I then endeavoured to find out the cause of them. I was already convinced that the apparent motion of the stars was not owing to a nutation of the earth's axis. The next thing that offered itself was an alteration in the direction of the plumb-line, with which the instrument was constantly rectified; but this upon trial proved insufficient. Then I considered what refraction might do; but here also nothing satisfactory occurred.
Page 26 - ... if the earth's axis were perpendicular to the plane of its orbit, and the excessive variation which would result if the axis were nearly parallel to that plane.