Aryabhatiya: 8 key ideas
The core ideas of Aryabhatiya, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
A young astronomer's great work
Aryabhata wrote the Aryabhatiya around 499 CE, saying he was twenty-three at the time.
He worked at Kusumapura, near modern Patna, and his short text became one of the most influential works of Indian mathematics and astronomy.
- IDEA 2 OF 8
The text is compact verse
The Aryabhatiya is written in short verses that pack a great deal of information.
It is divided into sections covering numbers, mathematics, time and the movement of heavenly bodies. Later scholars wrote long commentaries on it.
- IDEA 3 OF 8
Numbers were written by place value
Aryabhata used a system based on place value, where a digit's position shows its value.
This approach helped make large calculations easier and supported later Indian mathematics. Indian numerals later spread worldwide.
- IDEA 4 OF 8
A close value for pi
Aryabhata gave an approximation of pi equal to about 3.1416, remarkably accurate for his time.
He also suggested that this value was an approximation. Few ancient values were so close.
- IDEA 5 OF 8
Tables of sines helped astronomy
Aryabhata gave methods for calculating sines, an important tool in trigonometry.
These calculations helped astronomers predict the positions of planets. His methods shaped trigonometry in later centuries, both in India and abroad.
- IDEA 6 OF 8
The Earth spins on its axis
Aryabhata proposed that the Earth rotates on its axis, explaining why the stars appear to move across the sky.
This was a bold idea that many later thinkers did not accept.
- IDEA 7 OF 8
Eclipses have natural causes
Aryabhata explained solar and lunar eclipses as caused by the shadows of the Earth and Moon, not by demons.
This was a scientific explanation based on observation. It marked a turn towards reason.
- IDEA 8 OF 8
Planetary motion was calculated
The text gives methods for calculating the movements of planets and time periods.
Aryabhata's work influenced astronomers in India and later in the Islamic world. An Indian satellite was later named after him.
Get one idea like this every daySwipe through ideas, go deeper on any of them, and save the ones that matter. Free.
Read Aryabhatiya in the app