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The lux value of the Sun is ok. The albedo of Earth is not constant, it depends on cloud cover and the location above oceans or land. Dragongeek is right, lux is defined by using the standard sensitivity of the human eye. Radiance as watts per square meter does not depend on the human eye's sensitivity for different wavelength. The radiance above the ...


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There are a few different ways, but basically they are fixed sensors in a linear array. There are usually two of them, pointed roughly 90 degrees apart. These sensors will have some pointed certainly at space, others pointed at Earth, and one or more pixels at the horizon. The brightness of the pixel on the edge, as well as its location, allows one to tell ...


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