DETERMINATION OF THE PERCENT OF TIME THE GROUND IS VISIBLE FROM AN AIRCRAFT FLYING ABOVE CLOUDS
STANFORD RESEARCH INST MENLO PARK CA MENLO PARK United States
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Equations were derived to express the percent of time the ground is visible from an aircraft flying above various conditions of cloudiness. To permit rapid solution of the equations over a wide range of cloud dimensions and aircraft height, nomographic charts were constructed. The assumptions made to simplify the equations, and the intended applications of the equations, are discussed.