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 10
... which being disposed in the same place , blend their lights together and a third class imagining it to be a peculiar fluid mass , exterior to the atmos phere of the planet , calculated to give addi- tional 10 ASTRONOMY .
... which being disposed in the same place , blend their lights together and a third class imagining it to be a peculiar fluid mass , exterior to the atmos phere of the planet , calculated to give addi- tional 10 ASTRONOMY .
Page 11
... phere of the planet , calculated to give addi- tional force and brilliancy to the rays of the sun , and thus compensating to the inhabitants ( if such there be ) for the prodigious distance at which they are removed from the grand prin ...
... phere of the planet , calculated to give addi- tional force and brilliancy to the rays of the sun , and thus compensating to the inhabitants ( if such there be ) for the prodigious distance at which they are removed from the grand prin ...
Page 50
... phere . But as many different places may have the same latitude , it is evident that the ascertain- ment of this particular alone is not sufficient to enable us to fix the exact situation of any place , either on sea or land . We may ...
... phere . But as many different places may have the same latitude , it is evident that the ascertain- ment of this particular alone is not sufficient to enable us to fix the exact situation of any place , either on sea or land . We may ...
Page 51
... as the latitude of any given place is its meridional distance from the equator , so the longitude of that place is its equatorial distance from the first meridian . If a place be situated in the eastern hemis phere ASTRONOMY . 51.
... as the latitude of any given place is its meridional distance from the equator , so the longitude of that place is its equatorial distance from the first meridian . If a place be situated in the eastern hemis phere ASTRONOMY . 51.
Page 52
... phere , it is said to have east longitude ; and if it lie in the western hemisphere , it is said to have west longitude : the longitude of any place being greater or less in proportion to its distance east or west from the first ...
... phere , it is said to have east longitude ; and if it lie in the western hemisphere , it is said to have west longitude : the longitude of any place being greater or less in proportion to its distance east or west from the first ...
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.