Hyperbolic version of Napier’s mnemonic

This article discusses the hyperbolic version of Napier's mnemonic, a memory aid for spherical trigonometry equations. The author notes that while the spherical version is famous for navigational calculations, the hyperbolic analog is more theoretical. The post lists the original spherical equations and their hyperbolic counterparts, replacing circular functions with hyperbolic ones. It references an old geometry book from 1919. The content is related to mathematics and geometry, specifically hyperbolic trigonometry, which falls under the IT/TECHNOLOGY project as it involves mathematical concepts relevant to computer science and algorithms.