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Geodesy is the scientific discipline that focuses on measuring and understanding the Earth's geometric shape, orientation in space, and gravitational field. It involves the study of the Earth's size, shape, and gravitational field through techniques such as satellite measurements, GPS technology, and surveying. Geodesy plays a crucial role in various applications, including mapping, land surveying, navigation, and geophysical studies. By accurately determining the Earth's surface and its variations, geodesy helps us better understand our planet and improve various technological and scientific endeavors.