In this first of four volumes on the history of astrology, Philip Graves dives into the twin topics of technical developments and planetary discovery and their effects on modern astrological practice. In Part One, Graves reveals a thorough history of house meanings from Manilius to Kepler and provides a thorough exploration of aspects from Kepler's additions to minor aspects through the centuries to John Addey's developments in harmonics. In Part Two, Graves reveals how astrologers came to create "Sun-sign" astrology as we know it today and discusses a surprising new source for the first Sun-sign column. He then takes us to the outer solar system, showing how the meanings of Uranus, Neptune, Pluto and even the three Liliths came to settle in the modern astrological canon. A definite must-read for any astrological enthusiast and professional practitioner.