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When at aphelion the planets move slower, and when at perihelion they move quicker than at the mean distance.Astronomers employ an imaginary circular orbit for the planets, in which they move at an uniform rate of velocity, which is called the mean motion.The literature of the subject is considerable, and the present writer only takes credit to himself so far as his own wide experience and practice have enabled him to present the subject in a simple and brief manner.
The annexed illustration will assist the lay reader perhaps.
If you imagine these bodies to be revolving in a plane around the Sun and yourself to be standing within the Sun, the motions of these bodies will appear almost uniform and always in one direction.
Were the orbits of the planets circular and the Sun holding the centre of the circle, their motions would be constant, that is to say, always in the same direction and at the same rate.
The discovery of argon did not destroy our conclusions regarding the nature and characteristics of oxygen or hydrogen or nitrogen, nor give an entirely new meaning to the word “atmosphere.” If even so many as seven new planets should be discovered, there would yet not be a single paragraph of this book which would need revising.
What is known regarding planetary action in human life is known with great certainty, and the effects of one planet can never be confounded with those of another.