Johann Heinrich Lambert

Johann Heinrich Lambert (1728-1777), was a brilliant, self-taught Swiss-German polymath who made major advancements in mathematics, physics, astronomy, and philosophy. In mathematics, Lambert achieved lasting fame by rigorously proving that the mathematical constant pi (π) is an irrational number. He was also a pioneer in non-Euclidean geometry and trigonometry. In physics, Lambert is considered a founder of photometry, the science of measuring light intensity, formulating the law governing light absorption known today as the Beer-Lambert law. Furthermore, he designed the first practical hygrometer to measure humidity and created advanced map projections, like the Lambert conformal conic, which are still used in modern cartography. Despite his humble beginnings, Lambert’s intense curiosity and diverse intellectual contributions significantly shaped the exact sciences, earning him high praise from contemporaries like Immanuel Kant.