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In the Middle Ages, alchemy and physic were naturally linked with astrology, which was regarded as applied astronomy. Since ancient times, fate had been considered the expression of divine will, emanating from the heavens and giving mankind signs in the constellations of stars and planets. Indeed, the Arabs and Ancient Greeks had made tables, schemes and catalogues of stars and constellations, as well as calendars used for navigation.
 
The movement of celestial bodies had an influence on political issues, on decisions about war or marriage. Even medical treatment, food preparation or tasks associated with agriculture were deemed to be subject to celestial mechanics. Based on the constellations, every person was assigned a sign of the Zodiac, which determined his health, career and social relationships throughout his life. Astrologers used many devices in their work, such as astrolabes, sextants, quadrants, sundials and other devices for accurate monitoring of the skies. Unlike today, astrology was a highly regarded and respected science and many astronomers of that time were also astrologers.

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