What i think Inner Earth may actually look like. Because the way light is bending, inner sun will always appear overhead in inner earth. Inner Earth is called Inner Circle in the book Etidorhpa where weird beings live, likely Nephilim. The Smoky God book talks about sanskrit speaking Giants that live there. Passport to Eternity book talks about visitations by sanskrit speaking inner earth humans. Reddish Inner Sun seen at the North Pole is probably mirage and appears read cuz of light passing through the glass sky.