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 111
... stars . RULE . - Rectify the globe for the latitude , and bring the sun's place ... star in the heavens ; and then observing some star which you know as the ... principal stars . PROBLEM V. To find the rising and setting of the ASTRONOMY ...
... stars . RULE . - Rectify the globe for the latitude , and bring the sun's place ... star in the heavens ; and then observing some star which you know as the ... principal stars . PROBLEM V. To find the rising and setting of the ASTRONOMY ...
Página 115
... star cut the quadrant in the given height ; and the index will point to the ... Principal stars , Al- tair of the first , Varia of the second magni- tude ... Principal star , Ca- pella of the first magnitude . Antlia Pneumatica , the Air ...
... star cut the quadrant in the given height ; and the index will point to the ... Principal stars , Al- tair of the first , Varia of the second magni- tude ... Principal star , Ca- pella of the first magnitude . Antlia Pneumatica , the Air ...
Página 116
... Principal stars Mirach and Almaak of the second magnitude . Ara , the Altar ... star Canopus of the first magnitude . Apparatus Sculptoris , situated in the ... Principal star , Arcturus of the first magnitude . Camelopardalis , situated ...
... Principal stars Mirach and Almaak of the second magnitude . Ara , the Altar ... star Canopus of the first magnitude . Apparatus Sculptoris , situated in the ... Principal star , Arcturus of the first magnitude . Camelopardalis , situated ...
Página 117
... star of the first magnitude . Canis Minor , the Lesser Dog , situated in the northern hemisphere ; extends from degree 105 to 120 on the equator ; passes between O and degree 15 on the meridian . Principal star Procyon of the first ...
... star of the first magnitude . Canis Minor , the Lesser Dog , situated in the northern hemisphere ; extends from degree 105 to 120 on the equator ; passes between O and degree 15 on the meridian . Principal star Procyon of the first ...
Página 118
... Principal star Alphecca of the second magnitude . Crux , the Cross , situated in the southern hemis- phere extends from degree 175 to 195 of the equator ; passes between degree 55 and 65 of the meridian . Circinus , the Compass ...
... Principal star Alphecca of the second magnitude . Crux , the Cross , situated in the southern hemis- phere extends from degree 175 to 195 of the equator ; passes between degree 55 and 65 of the meridian . Circinus , the Compass ...
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.