The present volume offers the first critical edition, accompanied with English translation and commentary, of Sefer ha-Moladot, which addresses the doctrine of nativities and the system of continuous horoscopy in nativities, and of Sefer ha-Tequfah, which is devoted exclusively to continuous horoscopy in nativities. The doctrine of nativities makes predictions about the whole of an individual’s subsequent life on the basis of the natal chart, and the system of continuous horoscopy in nativities is concerned with the interval between life and death and makes predictions based mainly on anniversary horoscopes, which are juxtaposed with the natal horoscope. To Abraham Ibn Ezra’s mind, not only are these two doctrines the core of astrology; they also epitomize the praxis of the astrological métier.