# Almagest

> astronomical treatise by Claudius Ptolemy

**Wikidata**: [Q155952](https://www.wikidata.org/wiki/Q155952)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Almagest)  
**Source**: https://4ort.xyz/entity/almagest

## Summary
The *Almagest* is an astronomical treatise written by Claudius Ptolemy in the 2nd century CE. It is a foundational work in the history of astronomy, systematically compiling and refining ancient Greek and Hellenistic astronomical knowledge. The *Almagest* introduced the geocentric model of the universe and remained a dominant astronomical text for over a millennium.

## Key Facts
- **Author**: Claudius Ptolemy, a 2nd-century Roman mathematician, astronomer, and geographer.
- **Inception**: Composed around 148 CE.
- **Classification**: An astronomical treatise, a formal and systematic written discourse on astronomy.
- **Related Work**: A literary work intended for enjoyment or edification.
- **Sitelink Count**: 63 (indicating its widespread recognition in knowledge bases).
- **Wikipedia Title**: *Almagest*.
- **Wikidata Description**: "Astronomical treatise by Claudius Ptolemy."

## FAQs
**What is the *Almagest*?**
The *Almagest* is a comprehensive astronomical treatise written by Claudius Ptolemy, which systematically organizes and expands upon ancient Greek and Hellenistic astronomical knowledge. It is considered one of the most influential works in the history of astronomy.

**Who wrote the *Almagest*?**
The *Almagest* was written by Claudius Ptolemy, a 2nd-century Roman mathematician, astronomer, and geographer. Ptolemy's other occupations included astrology, geography, and optics.

**When was the *Almagest* written?**
The *Almagest* was composed around 148 CE, though the exact date is uncertain. It was Ptolemy's most significant work.

**What is the significance of the *Almagest*?**
The *Almagest* introduced the geocentric model of the universe, which dominated Western astronomy for over a millennium. It also refined mathematical techniques for predicting celestial motions.

**How is the *Almagest* classified?**
The *Almagest* is classified as both a literary work and a treatise, meaning it is a formal, systematic written discourse intended for both enjoyment and edification.

## Why It Matters
The *Almagest* is a cornerstone of astronomical knowledge, shaping the understanding of the cosmos for centuries. Ptolemy's geocentric model, despite later being superseded by heliocentrism, laid the groundwork for medieval and Renaissance astronomy. The *Almagest* also introduced advanced mathematical methods for celestial calculations, influencing astronomers for over a millennium. Its systematic approach to astronomical data remains a model for scholarly discourse.

## Notable For
- **Foundational Text**: The *Almagest* compiled and refined ancient Greek and Hellenistic astronomical knowledge, making it a definitive work of its time.
- **Geocentric Model**: Ptolemy's geocentric model, despite its eventual replacement, dominated Western astronomy for over a millennium.
- **Mathematical Techniques**: The *Almagest* introduced sophisticated mathematical methods for predicting celestial motions, influencing later astronomers.
- **Influence on Medieval Astronomy**: The *Almagest* served as a primary reference for medieval and Renaissance astronomers, shaping their understanding of the universe.

## Body
### History
The *Almagest* was written by Claudius Ptolemy, a 2nd-century Roman mathematician, astronomer, and geographer. Composed around 148 CE, it was Ptolemy's most significant work. The *Almagest* systematically organized and expanded upon ancient Greek and Hellenistic astronomical knowledge, making it a foundational text in the history of astronomy.

### Classification
The *Almagest* is classified as both a literary work and a treatise. As a literary work, it is intended for enjoyment or edification, while as a treatise, it is a formal and systematic written discourse on astronomy. Its widespread recognition is reflected in its sitelink count of 63.

### Significance
The *Almagest* introduced the geocentric model of the universe, which dominated Western astronomy for over a millennium. It also refined mathematical techniques for predicting celestial motions, influencing astronomers for centuries. The *Almagest* remains a model for scholarly discourse in astronomy.

### Related Entities
- **Claudius Ptolemy**: A 2nd-century Roman mathematician, astronomer, and geographer, known for his work in astrology, geography, and optics. Ptolemy's citizenship was Roman, and his occupations included mathematics, astronomy, geography, astrology, optics, and music.
- **Literary Work**: A written work intended for enjoyment or edification, with a sitelink count of 20.
- **Treatise**: A formal and systematic written discourse on some subject, with a sitelink count of 38.

## References

1. A Short History of Astronomy
2. Freebase Data Dumps. 2013
3. Virtual International Authority File