This proper motion, if that of an actual star, is of the same order of magnitude as that of many stars. It would perhaps be interesting to glance at the relation between stellar movements and the greater cycles dealt with in ancient astronomy, for all analogy would indicate revolution in orbits to be a general law; and moreover, probabilities would indicate that our system is not too remote from the center of the stellar system. Assuming the average cross speed to be twenty miles per second, stars at 7 light-years distance would make one revolution while the Earth's apsides made four. Those at 70 light-years, one in a "great age." Those at the estimated distance of the farthest visible stars, 5000 light-years, would perform a revolution in just one manvantara of 308 million years. Doubtless all such revolutions are superposed on other lesser revolutions down to those known, as in cases of double stars, etc. And it may be suggested that there are not improbably a number of axes of revolution, or rather principal planes of revolution, having some harmonious mutual inclination. In order properly to relate the above mean value of the sidereal year to its present value, we should have to know our place in this cycle of 4320 thousand years; and the same observation applies to the other figures. We may return to this point at another time, as the necessary data are given in the same work. The effect of stellar proper motions, already referred to, would have to be considered. The figures for the Moon make the mean value of the sidereal month 1.103 seconds longer than its present estimated value. Those for Jupiter make its mean sidereal period about a quarter of a day shorter than the present one of 4332.58 days; while those for Saturn come out 6.55 days more than the present period of 10,759.22 days. The methods of calculation and tables connected with the _Sûrya-Siddhânta_ were rigorously applied by M. Bailly to an observed interval extending from the epoch in 3102 B. C. to a certain moment on May 21, 1282 of our era, at Benares--a period of 4383 years and 94 days; and the mean place of the Moon thus found was less than a minute of arc different from that calculated for the same interval by the modern tables of Cassini. An astronomy which could achieve a result like this by methods and tables at least five thousand years old, points to the enormous duration of some prior high civilization. The precessional movement of 54´´, peculiar to the _Sûrya-Siddhânta_, being referred to "Revatî" with its 4´´ direct motion, gives 50´´, like ours. It is as well perhaps to recall what Iamblichus states: The Assyrians have not only preserved the memorials of seven and twenty myriads [270,000] of years as Hipparchos says they have, but likewise of the whole apocatastases [planetary sidereal periods] and periods of the seven rulers of the world. (Proklos on Plato's _Timaios_, Bk. 1.) H. P. Blavatsky, commenting on this, says it is