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One might as well find entertainment in an attack upon the Magnetic Pole or a denunciation of the Precession of the Equinoxes. No one cared, they said, anything more about the failure of the laws of Moses than one did about such abstractions as the Earth's Axis, or the Great Glacial Epoch. It was quite different when the characters of well-known individuals were subjected to an assault.
They ascertained, as we have seen, the size of the earth by the measurement of a degree on her surface, determined the obliquity of the ecliptic, published corrected tables of the sun and moon fixed the length of the year, verified the precession of the equinoxes.
Hipparchus traced out this phenomenon, and established it on an impregnable basis, so that all astronomers have ever since recognised the precession of the equinoxes as one of the fundamental facts of astronomy. Not until nearly two thousand years after Hipparchus had made this splendid discovery was the explanation of its cause given by Newton.
He does not appear to have made observations himself in Alexandria, but he uses those of Aristyllus and Timochares of that place. Indeed, his great discovery of the precession of the equinoxes was essentially founded on the discussion of the Alexandrian observations on Spica Virginis made by Timochares.
They had spent all their time, to the surprise of onlookers, in spinning rounded stones on the beach, their object being to obtain a practical solution of the mathematical problem of "precession." Immediately Lord Kelvin was imitated by a dozen others.
The animal adopted as the symbol of the Hero is the sign of the Zodiac in which the Sun is at the vernal equinox of his age, and this varies with the precession of the equinoxes. Oannes of Assyria had the sign of Pisces, the Fish, and is thus figured. Mithra is in Taurus, and, therefore, rides on a Bull, and Osiris was worshipped as Osiris-Apis, or Serapis, the Bull.
His argument was, that if it were a mere shell filled with liquid, precession and nutation would be much larger than they are observed to be. For the shell alone would follow the pull of the sun and moon on its equatorial girdle, leaving the liquid behind; and being thus so much the lighter, would move the more readily.
The best passages are those in which she talks about herself, and gives her world in terms of her experience of it. Her views on the precession of the equinoxes are not important, but most important are her accounts of what speech meant to her, of how she felt the statues, the dogs, the chickens at the poultry show, and how she stood in the aisle of St. Bartholomew's and felt the organ rumble.
There is the annual fluctuation of the seasons; there is the eighteen or nineteen year period of the moon; there is the great period of the precession of the equinoxes, amounting to twenty-six thousand years; and then there is the stupendous Annus Magnus of hundreds of thousands of years, during which the earth's orbit itself breathes in and out in response to the attraction of the planets.
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.
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