Eclipses in Andalusian Manuscripts
As science advanced, understanding astronomy and the heavens became more than just a matter of belief and myth, but also a source of knowledge that could be systematically studied. Observations of the movements of the Sun, Moon, stars, and even eclipses were continuously conducted to understand the order of the universe. This development became even more evident during the golden age of Islam in Andalusia, when astronomy became a highly developed and widely studied branch of science.
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| Phases of the Moon Manuscript and Eclipses Theory. (Source:bibliotecanatalie.com) |
Amidst the advancement of Islamic civilization in Andalusia, the sky was viewed not only as a natural beauty but also as an object of scientific study. The movements of celestial objects were meticulously observed and then recorded in various astronomical manuscripts that developed in centers of learning such as Cordoba and Toledo. Among the various celestial phenomena that captivated Andalusian scientists, eclipses were among the most studied, considered crucial for understanding the patterns of celestial movements. Through these manuscripts, knowledge of eclipses was not only recorded and passed down but also further developed, significantly influencing the development of astronomy in both the Islamic world and Europe.
Andalusia as a Center for Astronomical Observation in Spain
Islam began to enter the Andalusia region or the Iberian Peninsula in the early 8th century AD, precisely in 711 AD, when Muslim troops led by Tariq ibn Ziyad crossed the Strait of Gibraltar on the orders of Musa ibn Nusayr during the reign of Al-Walid I. This conquest succeeded in ending the rule of King Roderic of the Visigoth Kingdom and marked the beginning of the establishment of Islamic rule in the region which later became known as Al-Andalus.As Islamic rule expanded, Andalusia grew into one of the most advanced centers of civilization in the Western world. Cities like Cordoba, Granada, and Toledo flourished as centers of learning, teeming with universities, libraries, hospitals, and observatories. This progress was driven by the spirit of Islamic scholarship, which placed knowledge as a vital component in understanding nature and human life. It was from Andalusia that various fields of study, such as philosophy, medicine, mathematics, astronomy, architecture, and literature, flourished and exerted a significant influence on the development of science in medieval Europe.
Astronomy and mathematics developed rapidly in Andalusia, driven not only by practical needs but also by a scientific curiosity to understand the order of the universe. One important figure in this field was Al-Zarqali, also known as Arzachel, an Andalusian scientist known for compiling the Toledan Tables, astronomical tables that would later have a significant influence on the development of astronomy in the Western world. He also developed the astrolabe, an astronomical instrument used to measure the positions of stars, determine time, and aid navigation with a high degree of accuracy. Through this combination of astronomy and mathematics, Andalusian scientists sought to explain the order of the heavens with a rational approach that remained in harmony with religious values.
Besides Al-Zarqali, there was also Al-Majriti, a prominent 10th-century astronomer who played a role in refining the astronomical tables of Muhammad ibn Musa al-Khwarizmi. Al-Majriti also developed a calendar conversion table that allowed for more accurate recording of Persian historical events. Furthermore, he also contributed to discussions on planetary motion and the use of geographic coordinate systems. Various mathematical concepts developed in the Islamic world, such as algebra and decimal numbers, were later adopted and studied by Europe, becoming an important foundation for the development of navigation, physics, and modern technology.
In Andalusian society, astronomy was not merely viewed as a science but also had a crucial religious function. Through astronomy, scientists could determine prayer times, the direction of the Qibla, and even the calendar with a high degree of precision. This demonstrates how Islamic civilization in Andalusia was able to integrate scientific developments with the spiritual needs of everyday life.
Andalusian scientists recorded their observations in various astronomical manuscripts, which served as guides for research and learning. One famous work is the Toledan Tables, compiled by Al-Zarqali in Toledo. This manuscript contains astronomical tables of calculations regarding the positions of the Sun, Moon, and planets, as well as predictions of eclipses, which were widely used in Europe for centuries. Other manuscripts also discovered include:
On the Total Solar Eclipse
On the Total Solar Eclipse is a scientific manuscript written by astronomer Warren de la Rue, documenting his observations of the total solar eclipse of July 18, 1860, in Rivabellosa, Spain. This report is considered a landmark study in the history of astronomy because it includes observations of the solar corona.The observation of the total solar eclipse on July 18, 1860, was a pivotal moment in the history of modern astronomy. The phenomenon was observed in Rivabellosa, near Miranda de Ebro, Spain, by British astronomer Warren De la Rue. His observations were then presented in a lecture at the Royal Society on April 10, 1862.
Long before the eclipse, since late 1858, De La Rue had prepared various equipment to observe and photograph the phenomenon. After conducting extensive research on the best location, he chose Rivabellosa because it was considered to have ideal atmospheric conditions for astronomical observations. His interest in eclipse photography was also influenced by the discovery of a daguerreotype photograph of a total solar eclipse in 1851 while he was in Russia. The photograph is attributed to Dr. Busch of the Königsberg Observatory, although it is actually believed to have been taken by photographer Julius Berkowski at the request of the Royal Prussian Observatory. This photograph is known as one of the first photographs of a total solar eclipse in history.
Unlike the daguerreotype technique previously used, De La Rue chose the collodion method because it was considered more sensitive and practical for astronomical photography. In his observations, he used the Kew Photoheliograph, an instrument specifically designed for astronomical photography and developed in 1854. With this tool, De La Rue succeeded in producing very clear images of eclipses and became one of the important achievements in the development of modern astronomical documentation.
The Works of Al-Jayyān (Al-Jayyani)
One of the leading astronomers from Andalusia, Ibn Mu'adh al-Jayyani, also left a significant mark on the development of astronomy through his scientific manuscripts. He is known for writing various works discussing eclipse calculations and astronomical tables to help understand the movements of celestial bodies more accurately. One of his famous works is the Tabula Residuum Ascensionum, an astronomical manuscript now housed in Madrid and testifying to the development of the tradition of celestial observation in Andalusia during the golden age of Islam. |
| Solar Eclipse Maps July 1, 1709. (Source: eclipse.gsfc.nasa.gov) |
In his mathematical thinking, Ibn Mu'adh al-Jayyani explained that geometry is composed of five primary quantities: numbers, lines, surfaces, angles, and solids. This view differed significantly from the tradition of Greek mathematicians like Euclid, who did not include numbers as part of geometric quantities. However, for al-Jayyani, the concept of number played a crucial role in explaining ratios and mathematical relationships in geometry. With this approach, he developed various explanations based on definitions that he believed were generally understandable to mathematics students of his time.
Furthermore, al-Jayyani is also known for his seminal work on spherical trigonometry, "The Book of Unknown Arcs of a Sphere." This treatise is considered one of the most influential early works in the development of spherical trigonometry. In it, he discusses various formulas for right-angled triangles on the surface of a sphere, the general law of sines, and methods for solving spherical triangles using the concept of polar triangles. This work demonstrates how Andalusian scientists not only inherited mathematics from previous civilizations but also successfully developed it into a more advanced and systematic theory.
The development of astronomy in Andalusia demonstrates how Islamic civilization was once a significant center for the observation and development of celestial knowledge. Through astronomical manuscripts, eclipse calculation tables, and the works of scientists such as Al-Zarqali and Ibn Mu'adh al-Jayyani, Andalusia successfully gave birth to a scientific tradition that combined observation, mathematics, and rational thought. These works not only helped the people of their time understand phenomena such as eclipses and the movement of celestial bodies but also served as an important bridge for the development of astronomy in Europe. From Andalusia, it is seen that observing the sky is not just an effort understanding the universe, but also part of the long journey of humanity in seeking knowledge.
Writer: Muhammad Faizal Akbar (Astronomy Enthusiasts)
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