Muslim scholars and rulers adopted an approach that integrated beneficial knowledge from past civilizations while rejecting inaccuracies. By the 8th century, centered in Baghdad, intellectual and scientific progress flourished under Muslim rule. Among the most remarkable achievements was the advancement of astronomy.

The Pre-Islamic State of Astronomy

Astronomy is one of the oldest fields of study in human history. Even before systematic studies of the sky and stars began, ancient humans viewed the celestial realm with awe and wonder. As civilizations evolved, humans started observing celestial bodies and formulating conclusions based on their movements. This pursuit of knowledge progressed differently in various parts of the world, primarily in India (through Sanskrit texts), China, Rome, and Egypt.

Between 4000 BCE and 1000 BCE, many cultures around the world flourished, especially in China, India, Mesopotamia, and Egypt. These civilizations conducted continuous inquiries related to agriculture, governance, and celestial phenomena. Scholars of that time observed and recorded the timing of seasonal rains, river floods, temperature changes, and other environmental patterns through astronomical observations.

By 3000 BCE, astronomy-related studies had already gained prominence in India as part of the Indus Valley Civilization. In the 2nd century BCE, scholars of the Shunga Empire in Magadha classified stars into different categories. However, one of the most significant contributions to the development of astronomy came from the Indian mathematician and astronomer Aryabhata (476–550 CE). His magnum opus, Aryabhatiya, written in Sanskrit, consists of 121 verses detailing astronomical discoveries.

 Contributions from the Classical World

The Greek philosopher Aristotle made notable contributions to astronomy, particularly through his theories on comets. As early as the 3rd century BCE, scholars began classifying stars based on their properties. In the 2nd century CE, the Greco-Roman scholar Ptolemy, working in Alexandria, systematically categorized 1,022 stars. His work became one of the most significant pre-Islamic contributions to astronomy.

The dominant model of the universe during this time was the geocentric model, which posited that all celestial bodies revolve around the Earth. This concept, supported by Aristotle and Ptolemy, remained widely accepted for centuries. The Greek astronomer Hipparchus also played a crucial role in this field by creating the first precise star catalog.

 In China, the Shang dynasty (1600–1050 BCE) meticulously classified and named stars, demonstrating that astronomy had been systematically studied across various major civilizations for centuries.

The Decline of Knowledge in Europe and the Rise of Islamic Science

However, from the 5th century CE onward, Europe experienced an intellectual decline, a period referred to in history as the Dark Ages. The fall of Rome was a major contributing factor to this stagnation. With the collapse of the Roman Empire, scientific and philosophical inquiry slowed down significantly in Europe.

In contrast, a new era of intellectual and scientific progress began with the rise of Islam. Under Islamic rule, centers of learning such as Baghdad, Damascus, and Cordoba flourished, fostering advancements in various scientific fields, particularly astronomy. This period saw the revival, preservation, and expansion of knowledge, laying the foundation for future discoveries that would later influence the Renaissance in Europe.

The Beginnings of Muslim Astronomical Inquiries

Muslim scholars undertook more precise investigations in astronomy by building upon the contributions of the Greek scholar Ptolemy, who passed away in Alexandria in 168 CE. They also incorporated the astronomical knowledge developed by Indian, Chinese, and Persian scholars. By the 8th century, texts related to this field from Greek and Persian sources were meticulously translated into Arabic. Scholars such as Abu Hasan al-Tamimi and Abu Ma’shar al-Balkhi played a significant role in these translation efforts and in compiling supplementary information.

Muslim astronomical inquiries were driven by both religious and intellectual motivations. A notable observation from Stephen P. Blake’s book, Astronomy and Astrology in the Islamic World, published by the University of Edinburgh, highlights this aspect: Since the Holy Qur’an frequently references the sun, moon, and stars, Muslims had a foundational awareness of their movements as part of their religious practice.

Moreover, several essential obligations mentioned in the Qur’an are closely linked to celestial bodies. The Islamic fasting month of Ramadan begins based on the lunar calendar, making moon sighting a fundamental aspect of religious observance. Similarly, the five daily prayers are scheduled according to changes in sunlight throughout the day, requiring precise knowledge of the sun’s movement. Ritual acts such as prayer (ṣalāh), animal sacrifice, and the burial of the deceased must all be performed while facing the Ka‘bah in Mecca, further necessitating an understanding of direction and celestial positioning.

Thus, religious injunctions played a crucial role in fostering Muslim expertise in astronomy. The need to accurately determine prayer times, lunar phases, and the qibla direction encouraged rigorous astronomical study, leading to remarkable advancements in the field. These practical applications, combined with intellectual curiosity and scholarly dedication, positioned Muslim astronomers as pioneers in the history of astronomical sciences.