## 1. Astronomer & Math Genius

Al-Battani was a renowned astronomer and mathematician who made significant contributions to trigonometry. He was the first to accurately calculate the length of a year, and he also elaborated on a number of trigonometric relations that had been transmitted from India and Greco-Rome. His work was so influential that it was used by later astronomers such as Copernicus and Tycho Brahe. Al-Battani's discoveries helped to shape the field of trigonometry and astronomy, and his legacy continues to this day.

**Also** → Tycho Brahe: The Man Who Revolutionized Astronomy

## 2. Al-Battani's precision in astronomy still referenced today

Al-Battani, an influential astronomer from the 9th century, is renowned for his groundbreaking work in astronomy. He is particularly known for his refinement of existing values for the length of the year, which he determined to be 365 days, 5 hours, 46 minutes, and 24 seconds - a figure that is only off by a few seconds from the modern-day calculation. His work was so precise that it was used for centuries afterwards, and is still referenced today.

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## 3. Astronomy Trailblazer

Al-Battani was a renowned astronomer who made significant contributions to the field of astronomy. He was able to correct some of Ptolemy's results and compiled new tables of the Sun and Moon, which were long accepted as authoritative. His work was so influential that it was used for centuries afterwards, and his tables of the Sun and Moon were used to calculate the positions of the planets and stars. Al-Battani's work was so precise that it was even used to calculate the dates of eclipses and other astronomical events. His work was a major contribution to the field of astronomy and is still studied today.

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## 4. 9th c. Astronomer & Science Pioneer

Abu al-Abbas al-Battani, also known as Albategnius, was a 9th century Persian astronomer and mathematician whose work was instrumental in the development of science and astronomy. He was the first to accurately calculate the length of the solar year, and he also developed trigonometric tables and improved the accuracy of the equinox. He also made significant contributions to the study of the precession of the equinoxes, the motion of the planets, and the calculation of the solar and lunar eclipses. Al-Battani's work was so influential that it was used by Copernicus and other astronomers for centuries.

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## 5. Al-Battani was highly influential in the Copernican Revolution

The renowned astronomer Al-Battani was highly influential in the Copernican Revolution, with Copernicus himself citing him in his seminal work, De Revolutionibus Orbium Coelestium. Al-Battani's contributions to astronomy included the calculation of the precession of the equinoxes, the determination of the obliquity of the ecliptic, and the compilation of a star catalogue. His work was so influential that it was used by Copernicus to help formulate his revolutionary theories about the structure of the universe.

**Also** → Contrasting Scientific Theories of Johannes Kepler and Galileo Galilei

## 6. The 9th century astronomer who helped shape astronomy

The 9th century astronomer Al-Battani was a pioneering figure in the field of astronomy, and his observations were so impressive that they caught the attention of two of the most renowned astronomers of all time: Johannes Kepler and Galileo Galilei. Both Kepler and Galileo were fascinated by Al-Battani's observations, and used them to further their own research and discoveries. Al-Battani's work was so influential that it is still studied today, and his contributions to the field of astronomy are still highly regarded.

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## 7. Al-Battani, 9th century mathematician, pioneer in trigonometry

Al-Battani, a 9th century mathematician, was a pioneer in trigonometry. He developed a number of trigonometrical relationships, such as the sine theorem and the chordal area theorem, which are still used today in mathematics and astronomy. His work was so influential that it was used by later mathematicians such as Copernicus and Galileo. He also developed a method for calculating the direction of the qibla, the direction of prayer for Muslims, which is still used today. Al-Battani's contributions to mathematics and astronomy have been invaluable and his work continues to be studied and appreciated by scholars around the world.

**Also** → Galileo Galilei: A Pioneer in Astronomy

## 8. 9th-Century Astronomer & Mathematician

Al-Battani was a renowned astronomer and mathematician who lived in the 9th century. He is credited with making significant improvements to the armillary sphere, a device used to measure the positions of stars and planets. His version of the armillary sphere was more precise than earlier versions, and it was used for centuries afterwards to measure the positions of celestial bodies. Al-Battani's work was so influential that it was used by later astronomers such as Copernicus and Galileo.

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## 9. 9th c. Astronomer Extraordinaire

Al-Battani, an influential astronomer from the 9th century, devoted much of his time to making astronomical observations and compiling the data for his renowned work, the Kitab al-Zij (The Book of Astronomy) or simply the Zij. This book was a major contribution to the field of astronomy, containing detailed information on the movements of the sun, moon, and stars, as well as the calculation of the solar and lunar eclipses. Al-Battani's work was highly influential in the development of astronomy and is still studied today.

**Also** → Ibn Rushd: 12th Century Philosopher & Astronomer

## 10. Improving Ptolemy's Methods

Al-Battani, a renowned astronomer from the 9th century, made significant improvements to the methods used by the great Greek astronomer Ptolemy. He was the first to introduce the concepts of sine, cosine, tangent, and cotangent, which revolutionized the field of astronomy. His work was so influential that it was used for centuries afterwards, and is still studied today. Al-Battani's contributions to astronomy are invaluable, and his legacy will continue to be remembered for generations to come.

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