# Ahmad ibn Muhammad ibn Kathīr al-Farghānī

> Abbasid astronomer (c. 800 – 870)

**Wikidata**: [Q336550](https://www.wikidata.org/wiki/Q336550)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Al-Farghani)  
**Source**: https://4ort.xyz/entity/ahmad-ibn-muhammad-ibn-kathir-al-farghani

## Summary

Ahmad ibn Muhammad ibn Kathīr al-Farghānī was born in the Ferghana Valley. His religion was Islam.

## Summary
Ahmad ibn Muhammad ibn Kathīr al-Farghānī, also known as Alfraganus, was a prominent Abbasid astronomer, mathematician, and astrologer active during the Islamic Golden Age. He is best known for his scholarly work at the House of Wisdom in Baghdad and his significant contributions to the fields of astronomy and mathematics. His legacy endures in the modern era through a lunar crater named Alfraganus in his honor.

## Biography
- **Born:** c. 800
- **Nationality:** Abbasid Caliphate
- **Known for:** Contributions to astronomy and mathematics during the Islamic Golden Age
- **Employer(s):** House of Wisdom
- **Field(s):** Astronomy, Mathematics

## Contributions
- **"Compilatio astronomica":** Al-Farghānī is associated with the work "Compilatio astronomica," an astronomical compilation documented in historical records, including a 1493 edition preserved in bibliographic collections.
- **Scholarship at the House of Wisdom:** He contributed to the intellectual and scientific activities of the House of Wisdom, the major research center and translation institute in medieval Baghdad that played a pivotal role in the Islamic Golden Age.
- **Astronomical and Mathematical Research:** His work as an astronomer and mathematician placed him among the notable scholars of the Abbasid era, helping to advance the understanding of celestial bodies and mathematical systems.

## FAQs
**What was Ahmad ibn Muhammad ibn Kathīr al-Farghānī's profession?**
He was a scientist specializing in astronomy, mathematics, and astrology, serving as a scholar within the Abbasid Caliphate.

**Where did Ahmad ibn Muhammad ibn Kathīr al-Farghānī work?**
He was affiliated with the House of Wisdom (Bayt al-Hikma) in Baghdad, which served as a library, translation institute, and research center during the medieval period.

**How is Ahmad ibn Muhammad ibn Kathīr al-Farghānī recognized today?**
He is commemorated by the "Alfraganus" lunar crater, a feature on the Moon named in his honor.

**What are the known dates of his life?**
While generally cited as living from c. 800 to 870, structured records list his date of death as 861 and a period of activity (floruit) around 900.

## Why They Matter
Ahmad ibn Muhammad ibn Kathīr al-Farghānī represents the intellectual vibrancy of the Abbasid Caliphate during the Islamic Golden Age. As a scholar at the House of Wisdom, he participated in a critical era of translation and research that preserved and expanded upon Greek, Persian, and Indian knowledge. His contributions to astronomy and mathematics helped establish the foundations for future scientific advancements in both the Islamic world and Europe. The enduring recognition of his name in lunar nomenclature highlights the lasting respect for his scientific achievements in the study of the cosmos.

## Notable For
- Being a distinguished astronomer, mathematician, and astrologer of the Abbasid era.
- Affiliation with the House of Wisdom in Baghdad, the epicenter of the Islamic Golden Age.
- Authorship or association with "Compilatio astronomica," a work referenced in historical bibliographic records from 1493.
- The lunar crater "Alfraganus," named in his honor.
- Holding citizenship in the Abbasid Caliphate during its peak years of scientific and cultural development.

## Body

### Identity and Names
Ahmad ibn Muhammad ibn Kathīr al-Farghānī is known by several names in historical records, including Alfraganus, Al-Farghani, Abū al-ʿAbbās Aḥmad ibn Muḥammad ibn Kathīr al-Farghānī, and Fergani. He is classified as a human (Homo sapiens) and specifically as an astronomer, mathematician, and astrologer. His life spanned approximately from 800 to 870 CE, though specific property records indicate a death date of 861 and a period of activity noted around 900.

### Historical Context: The Abbasid Caliphate
Al-Farghānī lived and worked during the era of the Abbasid Caliphate, the third Islamic caliphate that ruled from 750 to 1258 CE. This period is historically renowned as the Islamic Golden Age, with Baghdad serving as the capital and a cosmopolitan center of learning. The caliphate was responsible for initiating unprecedented advancements in science, philosophy, and culture, establishing institutions like the House of Wisdom to facilitate the translation movement. This movement preserved and transmitted classical Greek, Persian, and Indian knowledge, which would later influence European Renaissance thought. The Abbasid era saw the development of sophisticated administrative systems, including the vizier system, and the standardization of currency such as the gold dinar and silver dirham.

### Professional Affiliations: The House of Wisdom
Al-Farghānī was employed by the House of Wisdom (Bayt al-Hikma), a major library, translation institute, and research center in medieval Baghdad. Founded during the early Abbasid period, this institution was crucial to the caliphate's cultural and intellectual achievements. It served as a hub where scholars from various backgrounds collaborated to translate and analyze texts from ancient civilizations. Al-Farghānī's association with this place places him alongside other renowned scholars of the time, such as Al-Kindi and Al-Khwarizmi, who contributed to the fields of mathematics, science, and philosophy.

### Fields of Study: Astronomy and Mathematics
As an astronomer, Al-Farghānī engaged in the natural science dedicated to the study of celestial objects and phenomena. Astronomy, classified as an exact science and a branch of physical science, involves the systematic observation and theoretical modeling of the cosmos. During the Abbasid era, this field included sub-disciplines like astrometry, celestial mechanics, and planetary science, often supported by the use of instruments such as astrolabes and observatories.

In the field of mathematics, Al-Farghānī worked within a formal science concerned with the properties and relationships of numbers, quantities, and space. Mathematics in the Islamic Golden Age saw significant development in branches such as algebra, geometry, and arithmetic. This period was marked by the integration of mathematical logic with practical applications in engineering, astronomy, and commerce, laying the groundwork for modern scientific computation.

### Legacy and Recognition
Al-Farghānī's work has left a tangible mark on history. He is associated with "Compilatio astronomica," a text documented in bibliographic records as early as 1493. His influence extends beyond Earth; a lunar crater has been named "Alfraganus" in his honor. This recognition places him among the select group of scholars, such as Al-Battani and Al-Biruni, whose names are immortalized on the lunar surface, signifying their enduring contributions to humanity's understanding of the universe. His life and work exemplify the rich scholarly tradition of the Abbasid Caliphate and its pivotal role in the history of science.

## References

1. Virtual International Authority File
2. BnF authorities
3. International Standard Name Identifier
4. [Source](http://archive.wikiwix.com/cache/index2.php?url=http%3A%2F%2Fwww.encyclopedia.com%2Fdoc%2F1G2-2830901384.html)
5. Freebase Data Dumps. 2013
6. Czech National Authority Database
7. [Source](http://digitale.beic.it/primo_library/libweb/action/search.do?fn=search&vid=BEIC&vl%283134987UI0%29=creator&vl%28freeText0%29=al-%20Fargānī%20Aḥmad%20ibn%20Muḥammad)
8. Treccani's Enciclopedia on line
9. LIBRIS. 2012
10. [Source](https://islamansiklopedisi.org.tr/fergani)
11. HMML Authority File
12. Digital Scriptorium Catalog