Geodesy is the science that measures and represents the Earth’s shape, size, and gravitational field. It helps us understand how the Earth changes over time due to natural processes like tectonic movements and sea-level rise. By using advanced technology like satellites and GPS, geodesists can create accurate maps and models of our planet. This field is essential for various applications, including navigation, construction, and environmental monitoring. For example, GPS relies on geodetic measurements to provide precise location data. Overall, geodesy plays a crucial role in helping us navigate and manage our world effectively.