ABSTRACT
J. Vernet has established the role of al-Andalus and that of the Medieval Cultures of the Iberian Peninsula in the process of transmission of Eastern Islamic Astronomy into Medieval Europe. With a few rare exceptions, only those astronomical works which were known in al-Andalus were later translated into Latin, Romance languages or Hebrew and, thus, became influential in the development of European Astronomy. Our understanding of the history of the methods used to divide the houses of the horoscope has been considerably improved by John North’s Horoscopes and History. He has, for example, advanced the chronology of the fixed boundaries methods traditionally ascribed to Campanus of Novara (prime vertical) and to Regiomontanus (equatorial): according to these methods, the ecliptic is divided by six great circles which go through the North and South points of the local horizon and through equal divisions of 30° of the prime vertical or the equator, starting in both cases from the East or West point.
