Calendarium

The Calendarium was a significant work by the 15th-century mathematician and astronomer Regiomontanus. This publication was a calendar that provided daily astronomical positions, showcasing his advanced computational skills. It was one of the few works he managed to print, and it included astronomical diagrams and numerical tables, pioneering their use in printed materials.1

Regiomontanus was a leading figure in 15th-century European mathematics and astronomy. He also collaborated on astronomical projects and made significant contributions to trigonometry, formalizing plane and spherical trigonometry in his work De triangulis omnimodis. His Ephemerides, which provided daily planetary positions, was a testament to his computational abilities and was influential for centuries.123