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 1
... Hence the pole of a great circle is 90 ° from every point of upon the sphere ; because every angle PCR being a right angle , the arc PR is everywhere 90 ° . And as the axis PE is perpen- dicular to the circle QRST when it is ...
... Hence the pole of a great circle is 90 ° from every point of upon the sphere ; because every angle PCR being a right angle , the arc PR is everywhere 90 ° . And as the axis PE is perpen- dicular to the circle QRST when it is ...
Strona 2
... Hence , secondaries must be perpendicular to their great circles ; for , if one line be perpendicular to a plane , any plane passing through that line will also be perpendicular to it ; there- fore , as the axis PE of the great circle ...
... Hence , secondaries must be perpendicular to their great circles ; for , if one line be perpendicular to a plane , any plane passing through that line will also be perpendicular to it ; there- fore , as the axis PE of the great circle ...
Strona 3
... Hence , the arc BD of such a small circle measures the angle at the pole between the two great circles . Also , QR BD :: QC : BA :: radius : cos . BQ . 14. The axis of the earth pep'q is that diameter pop ' about which it performs its ...
... Hence , the arc BD of such a small circle measures the angle at the pole between the two great circles . Also , QR BD :: QC : BA :: radius : cos . BQ . 14. The axis of the earth pep'q is that diameter pop ' about which it performs its ...
Strona 4
... Hence the zenith and nadir are the poles of the ra- tional horizon ( 3 ) ; for the radius produced being perpendicular to the sensible , must also be perpendicular to the rational horizon . - 24. Secondaries to the horizon are called ...
... Hence the zenith and nadir are the poles of the ra- tional horizon ( 3 ) ; for the radius produced being perpendicular to the sensible , must also be perpendicular to the rational horizon . - 24. Secondaries to the horizon are called ...
Strona 11
... Hence , for the same reason that we may consider the points P , P ' as fixed , we may consider the circle ERQS as fixed . Now , as the latitude of any place b on the earth's surface is measured by the degrees of * This is not accurately ...
... Hence , for the same reason that we may consider the points P , P ' as fixed , we may consider the circle ERQS as fixed . Now , as the latitude of any place b on the earth's surface is measured by the degrees of * This is not accurately ...
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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.