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Optimax Systems, Inc. - Optical Components & Systems 2024 LB
Photonics Dictionary

nadir

In a remote sensing system, nadir refers to the point on the ground located vertically below the center of the system. In astronomy, the nadir is the vertical direction that points towards the force of gravity of a given location. For a satellite in orbit, the nadir is the downward field of view of that satellite.
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