Gravitation An Elementary Explanation of the Principal Perturbations in the Sol
Gravitation An Elementary Explanation of the Principal Perturbations in the Sol
Airy George Biddell
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) If the body describe a parabola or hyperbola, the sun is in the focus. (19. ) The planets describe ellipses which are very little flattened, and differ very little from circles. EXPLANATION OF PROJECTILE FORCE. 15 Three or four comets describe very long ellipses : and nearly all the others that have been observed are found to move in curves which cannot be dis- tinguished from parabolas. There is reason to think that two or three comets which have been observed move in hyperbolas. But as we d...o not propose, in this treatise, to enter into a discussion on the motions of comets, we shall confine our- selves to the consideration of motion in an ellipse. (20. ) Every thing that has been said respecting the motion of a planet, or body of any kind, round the sun, in consequence of the sun's attraction ac- cording to the law of gravitation, applies equally well to the motion of a satellite about a planet, since the planet attracts with a force following the same law (though smaller) as the attraction of the sun.
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