Eclipse observations from orbiting spacecraft
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The expected appearance of the earth and sun from within the earth's shadow-cone is derived for various distances from the earth's surface. Results suggest that unique information about the earth's upper atmosphere can be obtained from manned and unmanned spacecraft by utilizing well known eclipse techniques. It is shown that existing physical conditions permit the conduct of relevant experiments with simple instrumentation from most space missions within cislunar space. (See also RM-4249, RM-4321.)
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