Skyline coordinates from Depth.

Hello, guys.

Now, I am writing an Volmetric Fog shader for Reshade 3 and I have a question.
Is it possible to get "Y" coordinate of the scene's skyline using the information from the Depth buffer?

No. You can only know how far objects are away from you, but world space coordinates are not retrievable. Hence a volumetric fog is inefficient as the integral of the result can be done as a function itself.