husband and wife the Sun and Moon did not live happily together, some of these explaining the reason of seasons and weather. The myths and thoughts of the relationship between the Sun and Moon and their role in the universe are high in quantity. Correlations and connections can be made with some of these beliefs but oftentimes many disagree with others. Luminaries in medicine In early modern England, the medical effects of the Sun and the Moon had been traditionally explained by a vast symbolic system of "analogies, correspondences, and relations among apparently discrete elements in man and the universe," which had its conceptual origins in the works of Aristotle, Ptolemy, and Galen. The ultimate causes of planetary emanations had been considered "occult," an Aristotelian and early modern term utilized when distinguishing "qualities which were evident to the senses from those which were hidden" After the Restoration, many physicians attempted to rid the natural world of occult causes and to explain invisible forces solar and lunar emanations via mechanical, chemical, and mathematical systems. To explain the medical effects of the luminaries, the English physicians Richard Mead (1673-1754) and James Gibbs (d. 1724) utilized iatromechanism, which regarded the body as a Cartesian machine, conforming in its functions to mechanical laws. Physiological phenomena could thus be explained in terms of physics. Richard Mead subsequently applied Newton's gravitational theories to Pitcairne's hydraulic iatromechanism and astrological medicine. In De imperio solis ac lunae in corpora humana et morbis inde oriundis [A treatise concerning the influence of the Sun and moon on human bodies and the diseases thereby produced] (1704), Mead stressed the mechanical effects of solar and lunar emanations, especially the gravitational effects of the tides, on the pressure of vessels and fluids within the human body. Further reading Luminaries: The Psychology of the Sun and Moon in the Horoscope by Liz Greene, Howard Sasportas References History of astrology