👉 The term "cratometer" is a scientific instrument used for measuring and analyzing the shape of celestial bodies, especially the Earth's surface. It was first developed by Swiss astronomer Johann Balbi in 1750, who named it after his friend, the geographer and cartographer Christian von Ratisbonne, who had been instrumental in mapping the Earth's surface. The cratometer is a device that measures the curvature of the Earth's surface, which plays a crucial role
