Between the 8th and 12th centuries, Baghdad and the Islamic world played a decisive role in the history of astrology: by translating the Greek heritage, enriching it with their own contributions, and passing it on to the Latin West, Arab scholars ensured the continuity of a discipline that might otherwise have disappeared. Without this relay, the techniques you encounter in astrology as it is practiced today would probably not have survived the dissolution of the ancient world. What you practice or study as Western astrology therefore carries, often without your knowing it, the deep imprint of this Arab period.
From the 8th century onward, the Abbasid caliphate made Baghdad one of the greatest intellectual centers of the medieval world. In this context, a vast movement of systematic translation took shape: Greek, Persian, and Indian works were made accessible in Arabic, the language of knowledge par excellence of this civilization. Astrology, the direct heir to the Hellenistic tradition and in particular to the work of Ptolemy, was among the disciplines most actively transmitted and studied.
This movement unfolded over several centuries, from roughly the 8th to the 12th century, involving generations of translators, commentators, and theorists. The Islamic world did not simply preserve this heritage passively: it debated it, criticized it, and expanded it, giving rise to a distinctly Arab astrological tradition.
The first and arguably most fundamental contribution was the preservation and translation of the Greek heritage. Texts that might have been lost were copied, translated, and commented upon, thereby safeguarding centuries of ancient astrological thought. But Arab scholars did not limit themselves to this role as transmitters: they introduced original enrichments, developing in particular calculation techniques, methods of cyclical prediction, and a more systematic reflection on the theoretical foundations of the discipline.
It was then through the translations made at Toledo in the 12th century, to which Gerard of Cremona made a major contribution, that this enriched body of knowledge reached Latin Europe. This twofold movement, reception followed by retransmission, makes the Arab period a true bridge between Greek Antiquity and the Western Middle Ages.
Māshā'allāh, active toward the end of the 8th century, ranks among the first major Arab astrologers. Working at the Abbasid court in Baghdad, he contributed to establishing astrology as a discipline of court and governance, particularly in relation to what is known as mundane astrology. Abū Ma'shar, known in the Latin West as Albumasar and active in the 9th century, is one of the most influential figures in the entire history of Arab astrology: his work on major planetary conjunctions and his theoretical synthesis exerted considerable influence, first in the Islamic world and later in Europe after their translation. Al-Bīrūnī, an encyclopedic scholar of the 11th century, distinguished himself through a rigorous and critical approach.
His work, the Kitāb al-Tafhīm, stands as one of the most remarkable testimonies of this period: written in both Arabic and Persian, it sets out the foundations of astronomy and astrology with methodical clarity, while also reflecting a detached and analytical perspective on the discipline. This text illustrates the intellectual ambition of the Islamic scholarly world, which did not merely repeat the heritage it had received but sought to organize it, question it, and test its internal consistency.
The Arabic transmission constitutes an indispensable bridge to the Latin West. Thanks to the translations carried out at Toledo in the 12th century, particularly under the impetus of Gerard of Cremona, Arab works and, through them, the Greek texts they had preserved and enriched, became accessible to European scholars. This passage triggered a major astrological renewal in medieval Europe, which thus rediscovered a considerable body of knowledge whose direct thread had been lost.
What you know today as Western astrology, with its houses, its aspects, and its planetary cycles, carries within it the traces of this long journey: from Greek into Arabic, from Baghdad to Toledo, and from Toledo to the universities and royal courts of medieval Europe. The Arab period is therefore not a mere passive relay: it is a creative stage, without which Western astrology as it exists today would not have taken the same form.