The precession of the equinoxes is due to the fact that the earth performs a motion of this kind about its centre, and the whole class of such motions has therefore been termed precessional.
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.
Owing to the precession of the equinoxes it is longer than a tropical or sidereal year by 25 minutes and 2.3 seconds.
Gravitation was thus shown to be the sole influence governing the movements of planets and satellites; the figure of the rotating earth was successfully explained by its action on the minuter particles of matter; tides and the precession of the equinoxes proved amenable to reasonings based on the same principle; and it satisfactorily accounted as well for some of the chief lunar and planetary inequalities.
These two motions are defined with greater detail in the articles Precession Of The Equinoxes and Nutation.