Geodetic axes are reference lines used in geodesy, the science of measuring and understanding Earth's geometric shape, orientation in space, and gravity field. These axes help define the position of points on the Earth's surface and are essential for accurate mapping and navigation. The most common geodetic axes are the geodetic latitude and geodetic longitude, which provide a coordinate system for locating places on Earth. These axes are based on the Earth's rotation and its shape, allowing for precise calculations in various applications, including GPS technology and cartography.