Aryabhata-I (476-550 CE) : The great indian mathematician and astronomer of early India

In the field of Mathematics, he contributed to the development of algebra, plane trigonometry and spherical trigonometry. In the field of astronomy, by simply observing the heavens with unaided eyes and using indigenous mathematical tools, a young astronomer in India during the fifth century, accurately measured the period of Earth's rotation with respect to the fixed starts in the sky and deduced the shape of Earth and its rotation and did many remarkable works in Astronomy and Mathematics.