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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Página 101
... Letter , & c . with easy methods of ascertaining them . THE prime , or golden number , is , in other words , the ... letters of gold . It is of great utility in ascertaining the age and changes of the moon ; and may be easily found by ...
... Letter , & c . with easy methods of ascertaining them . THE prime , or golden number , is , in other words , the ... letters of gold . It is of great utility in ascertaining the age and changes of the moon ; and may be easily found by ...
Página 103
... Letter is so called because it is the lordly letter , or that which is placed in every calendar , against the first day of the week , or Sunday . There are seven Dominical letters answering to the days of the week , viz . A , B , C , D ...
... Letter is so called because it is the lordly letter , or that which is placed in every calendar , against the first day of the week , or Sunday . There are seven Dominical letters answering to the days of the week , viz . A , B , C , D ...
Página 104
... letter A , but we have previously remarked that this is used for Jan- uary . Supposing the year to consist only of ... letter G ; and as the subsequent year will begin on Tuesday , and the Sunday happen on the sixth day , the Do- minical ...
... letter A , but we have previously remarked that this is used for Jan- uary . Supposing the year to consist only of ... letter G ; and as the subsequent year will begin on Tuesday , and the Sunday happen on the sixth day , the Do- minical ...
Página 105
... letter G , so that every leap - year has two Dominical letters , one , which serves from the first of January to the twenty - fourth of February , and the other from the twenty - fifth of February to the end of the year . The general ...
... letter G , so that every leap - year has two Dominical letters , one , which serves from the first of January to the twenty - fourth of February , and the other from the twenty - fifth of February to the end of the year . The general ...
Página 106
... letter . CHAPTER XII . Of the General Principles of a Celestial Globe , with Problems , & c . THE artificial celestial globe is intended to represent the face of the heavens , on which all the fixed stars hitherto perceived by astro ...
... letter . CHAPTER XII . Of the General Principles of a Celestial Globe , with Problems , & c . THE artificial celestial globe is intended to represent the face of the heavens , on which all the fixed stars hitherto perceived by astro ...
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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.
Página 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...
Página 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...
Página 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...
Página 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.
Página 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.