Nadir Point
In space and astronautical engineering, the nadir point is the point on the Earth's surface that is directly below the spacecraft or satellite. It is the opposite of the zenith point, which is the point directly above the spacecraft or satellite. The nadir point is an important concept in remote sensing and Earth observation, as it is the point where the sensor or camera is looking directly at the Earth's surface. This allows for accurate measurements of features such as vegetation, water bodies, and urban areas. The nadir point can also be used to determine the spacecraft's position and orientation relative to the Earth.
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