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Updated: May 22, 2025
He showed how the tides were caused by the moon, and how the effect of the moon's action upon the earth is to draw its fluid parts into the form of an oblate spheroid, the axis of which passes through the moon. He also applied the law of gravitation to explain irregularities in the lunar motions, the precession of the equinoctial points, and the orbits of comets.
He found that this could be explained by a motion of the equinox in the direction of the apparent diurnal motion of the stars. This discovery of precession of the equinoxes, which takes place at the rate of 52".1 every year, was necessary for the progress of accurate astronomical observations.
The application of the generalisations of thermotics to the problem of the duration of the earth, and of deductions from tidal phenomena to the determination of the length of the day and of the time of revolution of the moon, in past epochs of the history of the universe; and the demonstration of the competency of the great secular changes, known under the general name of the precession of the equinoxes, to cause corresponding modifications in the climate of the two hemispheres of our globe, have brought astronomy into intimate relation with geology.
Translator. It must be admitted that M. Arago has here imperfectly represented Newton's labours on the great problem of the precession of the equinoxes.
The plane of the ecliptic must therefore be conceived as slowly revolving in such a way as gradually to circumnavigate the heavens. This important phenomenon is described as the precession of the equinoxes.
Thus a shade of their present superiority to men will always remain, and with it a shade of their relative inefficiency, and so marriage will remain attractive to them, or at all events to most of them, and its overthrow will be prevented. To abolish it entirely, as certain fevered reformers propose, would be as difficult as to abolish the precession of the equinoxes.
He also connected with the theory of gravitation the perturbation of precession discovered by Bradley, that remarkable oscillation which the earth's axis experiences continually during its movement of progression, and the period of which, amounting to about eighteen years, is exactly equal to the time which the intersection of the moon's orbit with the ecliptic employs in describing the 360° of the entire circumference.
We shall know it is stopped when the rockets burst. Yet "The War" has become a lethargic state of mind for us. We accepted it from the beginning with green-fly, influenza, margarine, calling-up notices, and death. It is as much outside our control as the precession of the equinoxes.
"I expect to have Hot Rod operational within five minutes. And Clark. Instruct the computer to discontinue precession operations that have been initiated. "Take whatever measures are necessary to carry out these instructions. "This is no longer an undercover operation, gentlemen. Security is taking control. "This is war."
It was to those of the latter on Spica Virginis that Hipparchus was indebted for his great discovery of the precession of the eqninoxes. Hipparchus also determined the first inequality of the moon, the equation of the centre.
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