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Ancient Encyclopedia Entry 1778317388

** The Celestial Atlas of Eudoxus, a groundbreaking ancient Greek astronomical treatise attributed to Eudoxus of Cnidus, is a foundational work in the field of astronomy that has significantly influenced the development of Western astronomical thought. **CONTENT:** ### Overview The Celestial Atlas of Eudoxus is an ancient Greek astronomical treatise that dates back to the 4th century BCE. Attributed to Eudoxus of Cnidus, a renowned mathematician and astronomer of the time, this work is considered one of the most significant contributions to the field of astronomy in the ancient world. The treatise is a comprehensive catalog of celestial bodies, including stars, planets, and constellations, which was compiled using Eudoxus' innovative method of spherical trigonometry. The Celestial Atlas of Eudoxus has had a lasting impact on the development of Western astronomical thought, influencing the work of later astronomers such as Hipparchus and Ptolemy. ### History/Background Eudoxus of Cnidus was born around 408 BCE in Cnidus, a city in ancient Greece. He was a prominent mathematician and astronomer of his time, known for his work on the measurement of the Earth's circumference and his development of the method of spherical trigonometry. The Celestial Atlas of Eudoxus is believed to have been written during Eudoxus' time in Egypt, where he was a member of the court of King Ptolemy I Soter. The treatise is thought to have been composed around 375 BCE, although the exact date of its composition is still a matter of debate among scholars. ### Key Information The Celestial Atlas of Eudoxus is a comprehensive catalog of celestial bodies, including stars, planets, and constellations. The treatise is organized into 27 sections, each corresponding to a particular constellation. Eudoxus used his innovative method of spherical trigonometry to calculate the positions and distances of celestial bodies, which allowed him to create a remarkably accurate model of the solar system. The Celestial Atlas of Eudoxus also includes a discussion of the movements of the planets and the Moon, as well as a description of the solar year. Some of the key features of the Celestial Atlas of Eudoxus include: * A catalog of 27 constellations, each corresponding to a particular section of the treatise * A discussion of the movements of the planets and the Moon * A description of the solar year and the cycles of the seasons * A use of spherical trigonometry to calculate the positions and distances of celestial bodies ### Significance The Celestial Atlas of Eudoxus is a foundational work in the field of astronomy that has significantly influenced the development of Western astronomical thought. The treatise's innovative use of spherical trigonometry and its comprehensive catalog of celestial bodies have made it a cornerstone of ancient Greek astronomy. The Celestial Atlas of Eudoxus has also had a lasting impact on the development of modern astronomy, influencing the work of later astronomers such as Hipparchus and Ptolemy. **INFOBOX:** - **Name:** Celestial Atlas of Eudoxus - **Type:** Ancient Greek astronomical treatise - **Date:** 375 BCE (approximate) - **Location:** Egypt (believed to have been written during Eudoxus' time in Egypt) - **Known For:** Comprehensive catalog of celestial bodies and innovative use of spherical trigonometry **TAGS:** Ancient Greek astronomy, Eudoxus of Cnidus, spherical trigonometry, celestial bodies, constellations, solar system, astronomy history, Western astronomical thought, Hipparchus, Ptolemy.