Direct Insolation Posted on 7th November 20152nd February 2023 by ThePD (The Project Definition) Direct Insolation is the sunlight falling directly to a surface element on Earth. (Opposite of the Diffuse Insolation) Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Technology and tagged radiology. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.