What is Descartes' secret formula about with regards to astronomy and geometry?

It's a secret. If I tell you, I have to kill you, to protect the secret. See?.

So, you don't want to know any secrets.

Using grid lines on toilet paper.

Coito ergo sum.

One key innovation of Descartes is the symbol of modern exponentiation, which allowed him to connect more closely the algebraic curve and the geometric form. Otherwise, "The Symbolic Language of Geometrical Figures" is of interest.