Cassini Map of France. An encyclopedia of the territory

In 1755, Cassini began a monumental undertaking: the creation of a geometric map of France, an endeavor that would last nearly sixty years. The exhibition at the Musée des Archives nationales reveals today the behind-the-scenes details of this exceptional work, the result of unprecedented scientific and cartographic expertise. Discover how four generations of Cassinis – astronomers and cartographers – meticulously surveyed the kingdom of France, using innovative instruments and mobilizing the expertise of scholars. The exhibition highlights revolutionary triangulation methods, collaboration with local inhabitants to name places, and the impact of this map on the country’s administrative organization. Thanks to unpublished documents, you will plunge into the fascinating world of creating an encyclopedia of the territory, a unique testimony to French ingenuity in the 18th century. Entirely free, this exhibition is a rare opportunity to contemplate a masterpiece of cartography and understand its legacy.