Medical astrology is an ancient medical system that associates various parts of the body, diseases, and remedies as under the influence of the luminaries and planets. According to Nicholas Culpepper, diseases may be opposed by Herbs of the planet opposite to the planet that causes them. The diseases of Jupiter can be remedied by the Herbs of Mercury , and the contrary; The diseases of the Luminaries by Herbs of Saturn , and the contrary; The diseases of Mars by Herbs of Venus , and the contrary.