Aryabhata (Devanagari/Indian and Nepalese alphabet: आर्यभट) (476 – 550 AD) was an Indian scientist from the classical Indian traditions of mathematics and astronomy. He is the father of the Indo-Arabic numeral system, which is universally used today. His well-known works are "Aryabhatiya" and "Arya-siddhanta". It was inspired by the name of the first Indian unmanned satellite launched.
Kidinnu is a Mesopotamian scientist who lived in the fourth century BC, whose name was given to a Lunar crater with a surface area of more than Croatia (60 km2), made lots of contributions to astronomy and mathematics, and is considered the “Father of science”.