A method is described for measuring spectral emissivity differences in the 8-13 micro region between two points on the lunar surface which may have different temperatures. Spectral emissivity differences of 0.5% on the moon can be detected in this wavelength region, excluding the strong 9.2-10 micro atmospheric ozone band where the accuracy is reduced to 2%. The application of this method to the bright planets is discussed.
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Goetz et al. (1967) studied this question.
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