Giordano Bruno was a philosophical maverick of the 16th century, who was burned at the stake in 1600. He is often portrayed as martyr to science because of his support for the heliocentric view of the solar system, however, the real reason why he was regarded as a heretic was quite different and had much more to do with his magical and spiritual views. The late Frances Yates (Giordano Bruno and the Hermetic Tradition) was the first to realize that Bruno was much more of a magician in the Hermetic tradition than any kind of proto-scientist. This lecture will discuss his views and the implications that they have for astrology. Bruno was much more of a magician than some kind of proto-rationalist.