Concave Earth simulation @DavidRidlen
Concave Earth simulation  @DavidRidlen
Uploaded January 2023 | Updated September 2026, 1 week ago
A first pass simulation of "Concave Earth Theory," based on my interpretation of general descriptions by key Concave Earth proponents. The surface of Earth is supposedly on the inside of a sphere (as opposed to outside), with the cosmos contained within another inner "glass" sphere suspended by inexplicable forces. The Sun is a 140km-wide hemisphere with a black backside, again suspended and propelled by more inexplicable forces.

Even with convenient "bendy light" assumptions, I dont see how the Sun can ever appear to set or rise behind an earthen horizon. Instead, it would always rise and set behind the glass sky-sphere. And Earth should always appear to reflect in, and refract thru the "glass firmament."

This video was originally unlisted, and I sent a link for review by Concave Earth proponents for constructive feedback, so I could update before publicly representing their model. But I only received angry denial and insults, without any specifics. I get the same blanket "wrong!" response from Flat Earth proponents, without any practical corrections.
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David Ridlen |

Concave Earth simulation

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