When I visited the John Dee exhibition last week, I managed to get a decent picture of the horoscope that he had drawn in the margin of his copy of Ptolemy's Tetrabiblos:


( Read more... )

Long, long ago, in 1991, I was researching the medieval textbook Liber de arte astronomice iudicandi by the late twelfth-century English astrologer Roger of Hereford, which survives only in a dozen or so manuscripts. Various indications led me to try and compare his text with the earlier twelfth-century translation by Hermann of Carinthia of the ( Read more... )