The temperature of Venus, measured by the radiometric method, in the center of the disk turned out to be 20 higher than at the edges.

The temperature of Venus, measured by the radiometric method, in the center of the disk turned out to be 20 higher than at the edges. What does this fact indicate? What celestial object is known to have such a phenomenon?

This phenomenon is similar to the darkening of the disk towards the edge of the Sun and indicates an increase in temperature with depth. At the edge of the disk, radiation comes from higher and colder layers of the atmosphere.