In the early eighteenth century, at the peak of the Enlightenment, an unlikely team of European scientists and naval officers set out on the world’s first international, cooperative scientific expedition. Intent on making precise astronomical measurements at the Equator, they were poised to resolve one of mankind’s oldest mysteries: the true shape of the Earth. A thrilling tale of adventure, political history, and scientific discovery, Measure of the Earth recounts the greatest scientific expedition of the Enlightenment through the eyes of the men who completed it—pioneers who overcame tremendous adversity to traverse the towering Andes Mountains in order to discern the Earth’s shape. In the process they also opened the eyes of Europe to the richness of South America and paved the way for scientific cooperation on a global scale.