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Abstract
The article describes an extension of a classical model in the theory of radiative equilibrium of planetary layers. It is elaborated in the spirit of the Eddington approximation, by virtue of which analytical solutions become feasible. The extension consists in allowing for the (isotropically diffuse) reflection of solar radiation at the interface between a planet's atmosphere and its surface !ayer. Since the model also incorporates absorption of short-wave radiation, it encompasses earlier models of the same kind. As an illustration, it is applied to calculating the temperature profiles of both the Earth's atmosphere and its ocean.
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