Christian Doppler

Christian Doppler was a 19th-century physicist best known for his work on the Doppler Effect, which describes how the frequency of waves changes based on the motion of the source or observer. In geodesy, the study of Earth's shape, size, and gravitational field, the Doppler Effect is utilized in techniques like GPS. As satellites move relative to Earth, the signals they send are slightly shifted in frequency, allowing precise calculations of position and distance. This principle is crucial for accurate navigation, mapping, and understanding Earth's dynamics.