Nadir

In space and astronautical engineering, nadir refers to the point on the celestial sphere that is directly below the observer and perpendicular to the zenith. It is the opposite of the zenith, which is the point directly above the observer. Nadir is an important concept in spacecraft attitude control, as it is the direction in which a spacecraft points its instruments towards the Earth. This is important for Earth observation missions, as it allows for the collection of data and images of the Earth's surface. Additionally, nadir is used in navigation and guidance systems to determine the position of a spacecraft relative to the Earth.

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Nadir

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