The correct option is D All of above
Aryabhata,
a mathematician and a astronomer, wrote a book in Sanskrit known as the
Aryabhatiyam. He stated that day and night were caused by the rotation
of earth around its own axis, even though it seems as if the sun is
rising and setting everyday. He developed a scientific explanation for
eclipses as well. He also found a way of calculating the circumference
of a circle, which is nearly as accurate as the formula we use today.