Mathematical Tracts on the Lunar and Planetary Theories: The Figure of the Earth, Precession and Nutation, the Calculus of Variations, and the Undulatory Theory of Optics |
From inside the book
Results 1-5 of 45
Page 5
... orbit which the planet 1 describes would then be known . 9. In the actual case of the Sun and a planet , these bodies move about their common center of gravity . But their relative motion will be the same as if we suppose the Sun to be ...
... orbit which the planet 1 describes would then be known . 9. In the actual case of the Sun and a planet , these bodies move about their common center of gravity . But their relative motion will be the same as if we suppose the Sun to be ...
Page 6
... orbit which the Sun appears to de- net scribe about a planet is a conic section . Let M = mass of Sun ( estimated by the accelerating force which its attraction produces at distance 1 ) , M ' = that of the planet : let their distance ...
... orbit which the Sun appears to de- net scribe about a planet is a conic section . Let M = mass of Sun ( estimated by the accelerating force which its attraction produces at distance 1 ) , M ' = that of the planet : let their distance ...
Page 7
... orbit which the planet describes would then be known . 9. In the actual case of the Sun and a planet , these [ bodies move about their common center of gravity . But their relative motion will be the same as if we suppose the Sun to be ...
... orbit which the planet describes would then be known . 9. In the actual case of the Sun and a planet , these [ bodies move about their common center of gravity . But their relative motion will be the same as if we suppose the Sun to be ...
Page 12
... orbit will be altered : to assist us in the discovery of the orbit really described , the following theorem will be useful . 21. PROP . 5. The center of gravity of the Earth and Moon describes about the Sun , very nearly , an ellipse in ...
... orbit will be altered : to assist us in the discovery of the orbit really described , the following theorem will be useful . 21. PROP . 5. The center of gravity of the Earth and Moon describes about the Sun , very nearly , an ellipse in ...
Page 14
... so found , the angle Em'G . Now sin Em'G or Em'G , ( since it is a small angle , never exceeding 10 " ) = EG Y sin EGm ' : = M r E + Mr sin very nearly and , since T ω the orbits of the Earth and Moon are 14 LUNAR THEORY .
... so found , the angle Em'G . Now sin Em'G or Em'G , ( since it is a small angle , never exceeding 10 " ) = EG Y sin EGm ' : = M r E + Mr sin very nearly and , since T ω the orbits of the Earth and Moon are 14 LUNAR THEORY .
Other editions - View all
Common terms and phrases
analyzing plate angle angular velocity attraction axis bright co-ordinates coefficient common light Consequently cos² crystal curve different colours differential direction displacement distance disturbing force dR dR dt dt dt Earth ellipticity equal equation expression extraordinary ray front ƒ² glass Hence integration intensity investigation length longitude lunar lunar precession motion multiplied nearly Newton's rings node nutation ordinary ray parallel particles perigee perihelion perpendicular plane of incidence plane of polarization plane of reflection precession principal plane produced PROP proportion quantity radius vector refraction rhombohedron rings shew sin² spheroid suppose surface theory tion undulation vibration vt-x wave
Popular passages
Page 257 - We have, every reason,' he observes, ' to think that a part of the velocity of sound depends upon the circumstance that the law of elasticity of the air is altered by the instantaneous development of latent heat on compression, or the contrary effect on expansion. Now, if this heat required time for its development, the quantity of heat developed would depend...
Page 257 - Now, if this heat required time for its development, the quantity of heat developed would depend upon the time during which the particles remained in nearly the same relative state, that is, on the time of vibration. Consequently, the law of elasticity would be different for different times of vibration, or for different lengths of waves ; and therefore the velocity of transmission would be different for waves of different lengths. If we suppose some cause which is put in action by the vibration...
Page 306 - ... we easily arrive at this simple hypothesis explaining the whole : Common light consists of undulations in which the vibrations of each particle are in the plane perpendicular to the direction of the wave's motion. The polarization of light is the resolution of the vibrations of each particle into two, one parallel to a given plane passing through the direction of the wave's motion, and the other perpendicular to that plane ; which...
Page 198 - In planetary theory the adopted ratio of the mass of the Earth to the mass of the Moon is...
Page 229 - ... intensity of either. These intervals of silence and greatest intensity, called beats, will recur every second, but if the notes differ much from one another, the alternations will resemble a rattle ; and if the strings be in perfect unison, there will be no beats, since there will be no interference. Thus by interference is meant the coexistence of two undulations, in which the lengths of the waves are the same ; and as the magnitude of an undulation may be diminished by the addition of another...