**Fact 1**

He elaborated to a specified degree a number of trigonometric relations which were transmitted from India and Greco-Rome.**Fact 2**

One of Al-Battani's best-known achievements in astronomy was the refinement of existing values for the length of the year.**Fact 3**

He was able to correct some of Ptolemy's results and compiled new tables of the Sun and Moon, long accepted as authoritative.

Al-Battani’s work is considered instrumental in the elaboration to a specified degree of science and astronomy.

Copernicus also quoted him in the book that initiated the Copernican Revolution, the De Revolutionibus Orbium Coelestium.

Kepler and Galileo showed interest in some of his observations.

In mathematics, al-Battani produced a number of trigonometrical relationships:

Al - Battani did not invent the armillary sphere, but his sphere was more precise than earlier versions.

Much of his time was spent in making astronomical observations and in compiling the data that underlay his major work, known as the Kitab al - Zij (The Book of Astronomy) or simply as the Zij.

Al - Battani made use of such concepts as the sine, cosine, tangent, and cotangent, an improvement over the methods used by the greatest of the Greek astronomers, Ptolemy.

**Short about Al-Battani**

was an Arab astronomer, astrologer, and mathematician

**Related facts about**

LOAD COMMENTS AND JOIN THE CONVERSATION