## Aryabhata – I

November 29, 2008476 – 550 CE (CE is the same as AD and BCE is the same as BC)

“Chaturadhikam Shatamashtagunam Dvashashtistatha Sahasranam

Ayutadvayavi Shkambhasyasanno Vrttaparinahah” – Ganita Pada, 10 – Aryabhatiya.

Roughly translated: “Add 4 to 100, multiply by 8 and add to 62000. This is approximately the circumference of a circle whose diameter is 20000”

Implying PI = 62832/20000 = 3.1416

- One of his most important legacies is his accurate knowledge of the value of Pi. Especially when Pi could be expressed only as a whole number ratio as there was no system for decimal fractions back then.
- Prior to him, Vedic Sutras had expounded on geometric relationships for religious purposes such as altar construction and keeping track of calendars. Jain mathematicians also excelled at mathematics prior to Aryabhata.
- One of his works, “Aryabhatiya” has survived till today. It was written in Sanskrit and in poetic verse form containing 123 stanzas.
- Aryabhata provides methods to find out square roots and cube roots (Though the square roots have been thought of being found out before him)
- Since the value of Pi was known to him, he also gave the formulae to calculate the area of a circle and volume of sphere.
- One of his more complicated works was his derivation of the Sine Table. In fact, the modern trigonometric names ‘Sine’ and ‘Cosine’ are a mis-transcription of the words ‘jya’ and ‘kojya’ as introduced by Aryabhata. These were transcribed as Jiba and KoJiba in Arabic. They were then misinterpreted by Gerard of Cremona while translating an Arabic Geometry text into Latin. He took Jiba to be the Arabic word Jaib, which means fold in a garment, ie. Sinus.
- Aryabhata’s astronomical calculation methods were also very influential. Calendric calculations worked out by Aryabhata and followers have been in continuous use in India for the practical purposes of fixing the Panchangam or the Hindu calendar.
- Aryabhata was the first astronomer to make an attempt at measuring the earth’s circumference accurately. His estimation of 24,835 miles was a deviation of just 0.2% from the actual value.

So, the next time you hear the name of the first satellite launched by India to be “Aryabhata”, the Lunar Crater “Aryabhata”, Aryabhata Maths Competition or of the Aryabhata Research Institute of Observational Sciences (Near Nainital), you know who the great person was and why they are all named after him – After all, calculating the value of Pi when there was no decimal fraction system was like thinking of a car when the wheels were not invented!

**Destination Infinity**

wow, more to know in the vast world 🙂

by Princess November 29, 2008 at 11:48 amI am always fascinated by this…isnt it a wonderful??

by Sahaja November 29, 2008 at 5:10 pmand incidentally I collected this data myself too….

hmm…he must have been damn good at maths…wonder how he would have thought us..

by vishesh November 30, 2008 at 6:34 amI found the sine and cosine information very interesting. Sadly, most of the kids where I live are afraid of maths. Good maths teachers are also tough to find around here. The last one I knew wanted to name his son Aryabhatta. 🙂

by Rinchen December 2, 2008 at 4:47 pmI just knew about the Pi bit. It seems that he was Einstein’s baap! 🙂

by Amit December 7, 2008 at 11:17 amA mathemagician! 🙂

by An alien Earthling December 7, 2008 at 5:34 pm@Princess: “I am not young enough to know everything” is a famous quote which echo’s your views.

@Sahaja: Our history is with full of such great things. Only our present….. but glad to know that you too are interested in history.

@Vishesh: You always leave things open to interpretation – don’t you? ‘Thought about us’ is different from ‘Taught us’. Whether you do this wantedly, is a question to ponder 🙂

@Rinchen: Aryabhatta is a nice name. I too like such sanskrit names.

@Amit: Till now, I am not able to understand what Einstein has discovered….

@Raj: The magic part is a pun, I guess. But it suites the context.

Destination Infinity

by Destination Infinity December 7, 2008 at 7:34 pmhe was a genius.. nice to know about him 🙂

by kanagu December 8, 2008 at 3:31 pmI am having a school report on Aryabhata. Could you help by giving a bit more info?

by Rohit April 30, 2010 at 10:21 pmAryabhata is very genius in maths.

by Rohit April 30, 2010 at 10:21 pm