Firstly, Zero wasn't discovered. It should have been invented. Coming to the question, it was invented (used first) by Brahmagupta, not Aryabhata.
The concept of zero first appeared in India around 458 BC. Mathematical equations were spelled out or spoken in poetry or chants rather than symbols. Different words symbolized zero, or nothing, such as "void," "sky" or "space." In 628, a Hindu, born in India 598AD, from Bhinmal, astronomer and mathematician named Brahmagupta developed a symbol for zero — a dot underneath numbers. He also developed mathematical operations using zero, wrote rules for reaching zero through addition and subtraction, and the results of using zero in equations. This was the first time in the world that zero was recognized as a number of its own, as both an idea and a symbol.
Here is my link
https://steemit.com/newbieresteemday/@losthippie/my-take-on-steemit