Then our cycloidal curve falls of itself into the region of relativity. It would only be true if the Sun’s path in space were rectilinear, not otherwise. Now we have got to our point where the elements of our system assume coherence only by their relativity. This fact is so well established that scientific prediction is a thing assured. Every year there is issued a volume of astronomical facts which antedate our calendar by some three or four years. I refer to the _Nautical Almanac_. In this volume we shall eventually find not only that the tides have been correctly predicted, but that every phase of the Moon is accurately stated, its orbit among the stars clearly defined; the times of its occulting or hiding the various stars that happen to lie in its course; the time, place and magnitudes of the various eclipses, and a host of other phenomena, are seen to have been foretold. This knowledge could not be otherwise derived than from an intelligent study of an intelligible cosmos, and a clear definition of the laws governing cosmical relations. Keep that in mind. We live in a world of relativity. What we call cosmic laws have only a relative value. The Ptolemaic system of epicycles was relatively true to the view of the universe which regarded the Earth as the centre of the system. It answered to all the phenomena. It had an integrity of its own. When the view-point was shifted so that the Sun came to be regarded as the centre of the system, then the epicycle no longer held good. But the elliptical theory of Kepler was only a relative truth. The planets do not really move in elliptical orbits. They only appear to do so from the point of view of a _fixed_ central Sun. The theory, like that of Ptolemy, answers to the phenomena. The same can be shown in regard to the cycloidal system. In the astronomical text books it will be found that the Precession of the Equinoxes is ascribed to the change in the inclination of the earth’s axis caused by the attraction of the Moon and Sun, but principally of the Moon, on the equatorial bulge of the earth. The same text books will tell you that the Precession is found to be increasing, that the Moon is receding from the earth, and that the attraction of gravitation decreases as the square of the distance! All of which is a contradiction in terms. But since we have arrived at the fact of relativity in regard to what we are used to calling astronomical “facts,” we may as well face the situation and accept the universe as symbol. Then all facts concerning it come to be regarded as merely symbolical, and it is our business to relate this universal symbology to the things of our consciousness and the facts of daily life.