The cycle of Jupiter which is taken at sixty years, assumes a significance only when we have proved the fact of interplanetary action. This fact has been established both astronomically and astrologically. The planet Jupiter takes twelve years to perform a revolution in the zodiac, and five times twelve is sixty years. But Saturn has a period of thirty years, and twice this is also sixty years. Consequently, if the planets Saturn and Jupiter are acting together from the same part of the heavens at a given date, they will be together again in the same part of the heavens at the end of sixty years, with a small variation due to the actual difference of their periods. This fact has proved of astronomical value, inasmuch as it has enabled us to estimate the disturbance due to their mutual action in the orbits of both planets. The period at which these perturbations would recur has been estimated at 920 years by Laplace, who discovered it. These perturbations form what are called the Great Equations of the planets Saturn and Jupiter, when calculation is made of their longitudes in orbit. It may be useful to note that at the maximum the disturbance of Saturn due to Jupiter’s action is 49´, and that of Jupiter due to Saturn’s action is 21´. As the discovery was not made until 1786, it will naturally follow that all calculations made from Saturn’s position prior to the eighteenth century, when it was incorporated as a factor in the _Nautical Almanac_, must be to some extent at fault. As cosmic symbols these planets, Saturn and Jupiter, have great significance, and they were highly esteemed in the astrological thought of the ancients. Jupiter, as the most bulky of all the planets in the system, early claimed attention and took a foremost place in the pantheon. We find him as Jupiter-Ammon, as the Deva-pitar, Deo-pitar, and Jupiter of the Indian and Roman theogonies. He is found in the Sanskrit writings as Guru, the spiritual father or God-father, as the name Deo-pitar signifies, and also as Brihaspati, _i. e._ the Lord of Increase or Expansion. Similarly, Saturn was S’iva, the Destroyer, whose reputation for devouring his own offspring is referred to in the classical mythology of the Greeks. Thus Jupiter is Brahma, the Creator, and Saturn is S’iva, the Destroyer. Such a significance they are found to hold in the concept of modern astrologers. When, therefore, Jupiter is found in that part of the heavens which is empirically determined to have rule over the destinies of a country or people, there is found to be a period of expansion and prosperity; but when Saturn is thus placed the country suffers privations and losses. Let us look at some of these instances, as they have a direct bearing on the practical side of our occult studies, and give to the Law of Cycles an economic value.