| http://www.w3.org/ns/prov#value | - The position and orientation of the radiation receiver, i.e. the eye, relative to the surroundings are in this case estimated by the position and orientation of the craft, e.g. the aircraft, being measured by means of prior-art sensors and subsequently the orientation of the observer's head, often in the form of the orientation of his helmet or the like, relative to the craft, which can also be ca
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