A Treatise on Spherical Astronomy

Cambridge University Press, 1908 - 506 pàgines

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Pàgina 147 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Pàgina 146 - LAW I. Every body continues in its state of rest, or of uniform motion in a straight line, except in so far as it may be compelled to change that state by impressed forces.
Pàgina 301 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Pàgina 146 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Pàgina 496 - ... the ratio of the velocity of the Earth in its orbit to the velocity of light, might not need correction or modification.
Pàgina 244 - The space comprehended between the Tropic of Cancer and the Arctic Circle is the North Temperate Zone; and the similar space between the Tropic of Capricorn and the Antarctic Circle is the South Temperate Zone.
Pàgina 146 - To every action there is always an equal and contrary reaction ; or, the mutual actions of any two bodies are always equal and oppositely directed in the same straight line.
Pàgina 145 - Kepler, and is expressed by his second law, which is thus stated:— In the motion of a planet round the sun, the radius vector, drawn from the centre of the sun to the planet, sweeps over equal areas in equal times.
Pàgina 238 - We shall suppose that t is the part of the equation of time due to the obliquity of the ecliptic, and t
Pàgina 427 - Up to now we have been explaining to the best of our ability the revolutions of the Earth around the sun and of the moon around the Earth.

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