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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... Declination , Latitude , and Longitude of the Heavenly Bodies IV . On the Equation of Time V. On the Length of the Year , the Precession of the Equinoxes from Observation , and Obliquity of the Ecliptic VI . On Parallax VII . On ...
... Declination , Latitude , and Longitude of the Heavenly Bodies IV . On the Equation of Time V. On the Length of the Year , the Precession of the Equinoxes from Observation , and Obliquity of the Ecliptic VI . On Parallax VII . On ...
Strona 4
... declination ; of these , 24 , which divide the equator into equal parts , each containing 15 ° , are called hour circles . 20. Small circles , as dfgh , parallel to the celestial equator , are called parallels of declination . 21. The ...
... declination ; of these , 24 , which divide the equator into equal parts , each containing 15 ° , are called hour circles . 20. Small circles , as dfgh , parallel to the celestial equator , are called parallels of declination . 21. The ...
Strona 6
... declination circle passing through the body , measured according to the order of the signs . 36. The oblique ascension is an arc of the equator intercepted . between the first point of aries and that point of the equator which rises ...
... declination circle passing through the body , measured according to the order of the signs . 36. The oblique ascension is an arc of the equator intercepted . between the first point of aries and that point of the equator which rises ...
Strona 13
... declination . 79. If the spectator be at the equator , then E coincides with Z , and consequently EQ with ZN , and therefore PP ' with HR . Hence , as the equator EQ is perpendicular to the horizon , the circles ace , mrt , parallel to ...
... declination . 79. If the spectator be at the equator , then E coincides with Z , and consequently EQ with ZN , and therefore PP ' with HR . Hence , as the equator EQ is perpendicular to the horizon , the circles ace , mrt , parallel to ...
Strona 14
... declination . 81. The ecliptic , or that great circle in the heavens which the sun appears to describe in the course of a year , does not coincide with the equator , for during that time it is found to be only twice in the equator ; let ...
... declination . 81. The ecliptic , or that great circle in the heavens which the sun appears to describe in the course of a year , does not coincide with the equator , for during that time it is found to be only twice in the equator ; let ...
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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.