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Updated: June 14, 2025
In consequence of the movement which is commonly called the precession of the equinoxes, though it might more accurately be described as a kind of second rotation of the earth, the angle between the equator and the ecliptic steadily but very slowly varies.
Tell us, since you are voluntarily in the confessional, tell us why you kept back that explanation of its dependence on the Precession of the Equinoxes, which, at Professor Cram's finishing examination, in your school-girl days, you so glibly recited before your admiring papa and mamma?
Let us look first at the astronomical attributes of this once molten globe. From the inclination of its axis, there result the precession of the equinoxes and the many differences of the seasons, both simultaneous and successive, that pervade its surface. Thus the multiplication of effects is obvious.
The attack of palsy and apoplexy are known to recur with great frequency about the equinoxes. There are numerous instances of the effect of the lunations upon the periods of insanity, whence the name of lunatic has been given to those afflicted with this disease.
A moment's reflection regarding the obliquity of the earth's axis, nutation, the precession of the equinoxes, the eccentricity of the orbit and the changes in the position of the orbit, will show us what ample room there was for a special adjustment and adaptation between the earth and its satellite and between both to the solar centre.
Assyrian astronomical observations show an extraordinary development of practical knowledge. The movements of the sun and moon and of the planets were studied; the Assyrians knew the precession of the equinoxes and many of the fundamental laws of astronomy, and the modern nomenclature dates from their findings.
After patient observation, he satisfied himself that the required conditions were answered by a certain star that was stationary not far from the horizon. This was Vega, in the constellation Lyra, a star which, according to the precession of the equinoxes, will take the place of our pole-star 12,000 years hence.
His mathematical labours led to valuable results in the principles of equilibrium and the movement of fluids, in a new calculus, and in a new solution of the problem of the precession of the equinoxes. These contributions to what was then the most popular of the sciences brought him fame, and fame brought him its usual distractions.
Hooker, the General has ordered me on a brief personal reconnaissance to the Planet Jupiter, and I wish you to take care of my watch, lest it should be damaged by the Precession of the Equinoxes," he would have responded with a brief "All right, Sir," and a quick military gesture, and have put the thing in his pocket.
I have stated at the commencement of this Notice, that it is to D'Alembert we owe the first satisfactory mathematical explanation of the phenomenon of the precession of the equinoxes.
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