The tenth volume of “Classical Astrology” by S. A. Vronsky opens a new section - Transitology. This section will consist of four volumes. In this volume, a separate chapter is devoted to the general theory of transits. The subsequent chapters of this volume and the three subsequent ones will be devoted to the interpretation of transits - sequentially for each planet according to the signs of the Zodiac and the aspects of this transit planet to the natal planets, depending on the Field (house) of the horoscope. For the Moon, the author also gives interpretations of the aspects of the transit Moon to transit planets.