Geodesy is the science that measures and represents the Earth’s shape, orientation in space, and gravitational field. It combines various disciplines, including mathematics, physics, and engineering, to understand the Earth's dimensions and its changes over time. Geodesists use tools like satellites and ground-based measurements to gather data. This field is essential for various applications, such as navigation, mapping, and land surveying. By accurately determining positions on the Earth's surface, geodesy supports infrastructure development, environmental monitoring, and disaster management, ensuring that we can effectively manage our planet's resources and respond to natural events.