Astrology, علم النجوم ’Ilm an-Nujūm or علم الفلك ‘Ilm al-Falak) was a subject of study and debate by early Muslims. In early Arabic sources, ilm al-nujum was used to refer to both astronomy and astrology. In medieval sources, however, a clear distinction was made between ilm al-nujum (science of the stars) or ilm al-falak (science of the celestial orbs), referring to astrology, and ilm al-hay'ah (science of the figure of the heavens), referring to astronomy. Both fields were rooted in Arabian, Persian, Babylonian, Hellenistic and Indian traditions. Astrology was subject to consistent critiques by Muslim religious scholars and scientists. Astrological prognostications nevertheless required a fair amount of exact scientific knowledge and thus gave partial incentive for the study and development of astronomy.
Medieval refutations
The study of astrology was refuted by several medieval Muslim astronomers such as Al-Farabi (Alpharabius), Ibn al-Haytham (Alhazen), Avicenna, Abu Rayhan al-Biruni and Averroes. Their reasons for refuting astrology were often due to both scientific (the methods used by astrologers being conjectural rather than empirical) and religious (conflicts with orthodox Islamic scholars) reasons.
Ibn Qayyim Al-Jawziyya (1292–1350), in his Miftah Dar al-SaCadah, used empirical arguments in astronomy in order to refute the practice of astrology and divination. He recognized that the stars are much larger than the planets, and thus argued:
"And if you astrologers answer that it is precisely because of this distance and smallness that their influences are negligible, then why is it that you claim a great influence for the smallest heavenly body, Mercury? Why is it that you have given an influence to al-Ra's and al-Dhanab, which are two imaginary points [ascending and descending nodes]?"
Al-Jawziyya also recognized the Milky Way galaxy as "a myriad of tiny stars packed together in the sphere of the fixed stars" and thus argued that "it is certainly impossible to have knowledge of their influences.
Opinions of contemporary Muslim scholars
According to jurists, the study of astronomy (ilm al-hay'ah) is lawful, as it is useful in predicting the beginning of months and seasons, determining the direction of salat (prayer), and navigation. They agree that this branch of science is used in determining the beginning and end of the lunar months, e.g, that of Ramadan. As for astrology, this is considered by many Islamic scholars as haram (unlawful), as knowledge of the Unseen is known only by Allah(God). Dr. Husam al-Din Ibn Musa `Afana, a Professor of the Principles of Fiqh at Al-Quds University, Palestine, states the following:
"First of all, it is worth noting that the Arabs knew astronomy a long time ago. They would predict time through observing the movements of stars. According to the scholars of Shar`iah, there are two terms confused in many people's minds when it comes to dealing with the question in hand. These terms are astronomy and astrology. Astronomy is the science that deals with studying the movements of the celestial bodies and reducing observations to mathematical order. That science is useful in determining time, seasons, the direction of Prayer, etc. Astrology, on the other hand, is concerned with studying the positions and aspects of celestial bodies in the belief that they have an influence on the course of natural earthly occurrences and human affairs. Astrologists believe that the movements of stars have an influence on people's lives. Both Muslim astronomers and religious scholars refuse the prophecies of astrologists.
History
Medieval Islamic astronomy and astronomy continued Hellenistic and Roman era traditions based on Ptolemy's Almagest. Centres of learning in medicine and astronomy/astrology were set up in Baghdad and Damascus, and the Caliph Al-Mansur of Baghdad established a major observatory and library in the city, making it the world's astronomical centre. During this time knowledge of astronomy was greatly increased, and the astrolabe was invented by Al Fazari. Many modern star names are derived from their Arabic names.
Muslim astrologers defined a new form of astrology called electional astrology that could be used for all manner of divination in everyday life, such as the discovery of propitious moments for the undertaking of a journey, or the beginning of a business venture etc. They also were the first to speak of 'favourable' and 'unfavourable' indications, rather than categorical events.
Albumasur or Abu Ma'shar (805 - 885) was the greatest of the Arab astrologers. His treatise 'Introductoriam in Astronomium' spoke of how 'only by observing the great diversity of planetary motions can we comprehend the unnumbered varieties of change in this world'. The 'Introductoriam' was one of the first books to find its way in translation through Spain and into Europe in the Middle Ages, and was highly influential in the revival of astrology and astronomy there.
Muslims also combined the disciplines of medicine and astrology by being linking the curative properties of herbs with specific zodiac signs and planets. Mars, for instance, was considered hot and dry and so ruled plants with a hot or pungent taste - like hellebore, tobacco or mustard. These beliefs were adopted by European herbalists like Culpeper right up until the development of modern medicine.
The Muslims also developed a system called Arabic parts by which the difference between the ascendant and each planet of the zodiac was calculated. This new position then became a 'part' of some kind. For example the 'part of fortune' is found by taking the difference between the sun and the ascendant and adding it to the moon. If the 'part' thus calculated was in the 10th House in Libra, for instance, it suggested that money could be made from some kind of partnership.
Al Khwarizmi was one of the foremost medieval Islamic astronomers.
The calendar introduced by Omar Khayyám Neyshabouri, based on the classical zodiac, remains in effect in Afghanistan and Iran as the official Persian calendar.
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