## 0476 – Aryabhata – bio

Born in the Assak region of central India around 476, Aryabhata was an Indian mathematician and astronomer who wrote a text in Sanskrit that is known as the Aryabhatiya. It was written in poetic verse and is a compilation of Indian knowledge of astronomy and mathematics at the time. Through this text, Aryabhata became the father of the Hindu-Arabic system of numbering that we still use today.

The section on astronomy covers:

- a heliocentric model of planetary orbits
- eliptical planetary orbits
- a description of planetary bodies shining because of reflected light
- an estimation of the length of a year (based on solar orbit) as 365 days and 6 hours
- an accurate estimate of the circumference of the Earth

(this remained the most accurate estimation for over a thousand years) - a belief that the axial rotation of the Earth causes the motion of the stars

The mathematical section covers:

- arithmetic (using decimal notation)
- algebra
- plane trigonometry
- spherical trigonometry
- continued fractions
- quadratic equations
- power series
- tables of sines
- an accurate estimation of the value of pi

This text would be translated into Arabic around 820 by al-Khwarizmi, introducing these advanced techniques into the Arabic world. The works of al-Khwarizmi were in turn later translated and migrated into the Italian Renaissance, bringing the HIndu-Arabic numeral system, algebraic techniques, trigonometry and advanced astronomical calculations forward into modern civilization.

PRECURSOR:

**-0575 – Pythagoras**

**-0325 – Euclid**

**-0190 – Hipparchus**

**0085 – Ptolemy**

SUBSEQUENT:

0598 – Brahmagupta

**0780 – al-Khwarizmi**

0973 – al-Biruni

1029 – al-Zarqali

**1048 – Omar Khayyam**