Ans.
Long before satellites and telescopes were invented, Aryabhata was looking up and calculating.
Born in Kusumapura (present-day Patna) in 476 CE, at the age of 23, he penned the Aryabhatiya, a seminal work on mathematics and astronomy.
According to his theory, the Earth revolves on its axis.
There are 365.258 days in a year:
The Earth's shadow, not Rahu-Ketu consuming the Sun and Moon, is what causes eclipses.
He provided a precise estimate of pi (π ≈ 3.1416).
A system for zero and place-value notation was also created by him.
This was all in the fifth century.
Writing equations wasn't all that Aryabhata did.
He changed the way we think about the cosmos.
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