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Medical astrology was based on the belief that the body’s “microcosm” corresponded to the “macrocosm” of the planets and stars and gave order to the seemingly random course of life and health. Thus, it assisted the physician in prescribing treatment, in predicting the course of a disease, and in casting horoscopes. This woodcut shows which constellation, symbolized by a sign of the zodiac, governs each region of the body. Aries governs the head as well as March (which was once the first month of the year), and so on. Consequently, the table advises that a region of the body should not receive medication when the corresponding sign is dominant. Thus, it is bad to treat the head in March, and “anyone who does so will cause a concussion or die.”