What is the color of the sky in a hollow earth?
Does the position of the sun in a hollow earth scenario affect the way light scattering would "color" the sky?
My understanding is the reddish-orange color during sunrise/sunset is caused by the sun being at a more oblique angle in contrast to the standard blue when the sun is fully up.
My intuition states that the sky's color wouldn't change much, or if it did would become a washed out version of whatever it normally would be, ie blue on Earth. The most dramatic coloring that I could imagine would be a gradient from say blue to red as you look from the center of the sky to the horizon, given an Earth colored sun and atmosphere. I doubt the gradient scenario is possible, but it would be neat if it was.
Of course a true hollow earth situation isn't possible. I'm mostly interested in how light scattering works when the light source is placed in the same setup.
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I wonder if you would even have a "sky", or if you'd just see the other side of the world through a haze?
We can see the moon in the daytime if it's in the right phase after all.
The entire surface of the interior would be lit equally, so if you looked up you'd probably see the shapes of oceans and rivers, fields, and anything else "large enough to be seen from space", depending on how large the interior of your world is of course.
There wouldn't be a horizon, as the horizon is caused by the Earth curving away from us.
Instead, if you looked out, you'd see the ground gradually slope up, like a hill that just keeps going and going.
If there is enough atmosphere and distance for light scattering to make something that looks like sky it would be a constant color (pale blue?) directly above you all the time, like it was noon, and as you looked down it would slowly change to more and more visible geography.
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