The Elements of Astronomy: Designed for the Use of Students in the UniversityJ. Smith, and sold by J. Deighton and J. Nicholson, 1811 - 297 |
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Strona 11
... considered as coinciding , the angle which the arc Ha subtends at the earth becoming then in- sensible , from the immense distance of the fixed stars . Now , if we suppose the earth to revolve daily about an axis , all the hea- venly ...
... considered as coinciding , the angle which the arc Ha subtends at the earth becoming then in- sensible , from the immense distance of the fixed stars . Now , if we suppose the earth to revolve daily about an axis , all the hea- venly ...
Strona 12
... considered as semi- circles . Now , as each circle HR , EQ , ZN , PP ' is perpendicular to the meridian , its pole must be in each ( 8 , 9 ) ; therefore their common intersection O is the pole of the meridian . Draw , also , the small ...
... considered as semi- circles . Now , as each circle HR , EQ , ZN , PP ' is perpendicular to the meridian , its pole must be in each ( 8 , 9 ) ; therefore their common intersection O is the pole of the meridian . Draw , also , the small ...
Strona 17
... considered the motion of the heavenly bodies in the eastern hemisphere ; but if this figure represent the western hemisphere , all the reasoning will equally apply . The On account of the continual change of declination of the sun ...
... considered the motion of the heavenly bodies in the eastern hemisphere ; but if this figure represent the western hemisphere , all the reasoning will equally apply . The On account of the continual change of declination of the sun ...
Strona 27
... considered as a small circle , must be increased in proportion as the radius is diminished , because ( Trig . Art . 75 ) , when the arc is given , the H h a P t angle is inversely as the radius , we have , sin . Px , or cos . dec . rx ...
... considered as a small circle , must be increased in proportion as the radius is diminished , because ( Trig . Art . 75 ) , when the arc is given , the H h a P t angle is inversely as the radius , we have , sin . Px , or cos . dec . rx ...
Strona 37
... considered as most proper for this purpose . Now , the earth revolving uniformly about its axis , the apparent diurnal motion of the fixed stars about the axis must be uniform . If a clock , therefore , be adjusted to go 24 hours from ...
... considered as most proper for this purpose . Now , the earth revolving uniformly about its axis , the apparent diurnal motion of the fixed stars about the axis must be uniform . If a clock , therefore , be adjusted to go 24 hours from ...
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aberration aphelion apogee apparent place appear astronomers atmosphere axis called Cassini centre circle clock comet computed conjunction consequently dark declination described determined diameter difference disc discovered diurnal motion draw earth eclipse emersion equal equinox excentricity fixed stars Flamstead gives greater Halley happen heavenly bodies heavens hence Trig Herschel horary motion horizon horizontal parallax hour angle inclination inferior conjunction interval Jupiter latitude libration light lunar magnitude Mars mean anomaly mean distance mean motion Mercury meridian altitude moon moon's orbit nearly node observed opposition orbit parallax parallel perihelion perpendicular phænomena Phil planet pole proper motion radius refraction revolve right ascension ring rotation satellite Saturn seen semidiameter shadow sidereal sine solar spectator spots sun and moon sun's supposed surface synodic revolution telescope tion Trans transit triangle true anomaly true longitude true place tude umbra Venus visible zenith
Popularne fragmenty
Strona 151 - 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 Object; and that, when the Eye is moving in different Directions, the apparent Place of the Object would be different.
Strona 141 - ... the squares of the periodic times are as the cubes of the distances from the common centre, the centripetal forces will be inversely as the squares of the distances.
Strona 6 - The Latitude of a star is its angular distance from the ecliptic measured on a circle of latitude.
Strona 180 - ... and therefore there is a greater probability of seeing a lunar than a solar eclipse. Since the moon is as long above the horizon as below, every spectator may expect to see half the number of lunar eclipses which happen.
Strona 217 - 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.
Strona 118 - ... it had a degree of brightness about as strong as that with which such a coal would be seen to glow in faint daylight.
Strona 204 - He further observes, that there are some additional circumstances in the appearance of extended clusters and nebula-, that very much favour the idea of a power lodged in the brightest part. For, although the form of them be not globular, it is plainly to be seen that there is a tendency towards sphericity, by the swell of the dimensions...
Strona 205 - ... in diameter. The star is perfectly in the centre, and the atmosphere is so diluted, faint, and equal throughout, that there can be no surmise of its consisting of stars ; nor can there be a doubt of the evident connection between the atmosphere and the star.
Strona 40 - The Equation of Time is computed by taking the Difference of the Sun's true right Ascension and his mean Longitude corrected by the Equation of the Equinoxes in right Ascension, and turning it into Time at the Rate of 1
Strona 72 - That the planets all move in elliptic orbits, of which the sun occupies one of the foci. 3. That the squares of the times of the revolutions of the planets are as the cubes of their mean distances from the sun.