Greetings! I'm looking for the ancient Snellius (Snell) Cyclometricus (Cyclometricvs) article (or its translation) about the computation of pi (quadrature of the circle). Is it available online? It seems Snell has arrived to an acceleration method to compute pi using only geometric reasoning. After calculus, this acceleration is explained using Taylor formula. Any references are welcome! Thanks in advance, Humberto.