What has the author Pandit Nilakantha Das written?

You are likely thinking of Pandit Nilakantha Somayaji, a prominent Indian mathematician and astronomer who lived in the 15th century. He was a major figure in the Kerala School of Astronomy and Mathematics.

Here are some of his most notable works:

* Aryabhatiyabhasya: A commentary on Aryabhata's seminal work, *Aryabhatiya*.

* Tantrasangraha: A comprehensive treatise on astronomy, which contained significant advancements in trigonometry, planetary calculations, and the theory of the Earth's rotation.

* Grahaganita: A work dedicated to planetary calculations.

* Siddhantatattvaviveka: A commentary on the astronomical work of Paramesvara, another important figure in the Kerala School.

These are just a few of Nilakantha's works. He was a prolific writer who made significant contributions to various branches of mathematics and astronomy.

It's important to note that "Pandit Nilakantha Das" is not a common name or title associated with Nilakantha Somayaji. The title "Pandit" is a general term of respect for scholars in India, while "Das" is a common surname.