>>17027472You see clouds and some hazy conditions where the sky and the ground meet at the camera's eye-level and assume some curvature into that. But we can already see hundreds of miles of straight horizon and also very straight surface btw that is in no way applicable to an 8inch x miles^2 curvature rate.
What you see in that photo is a horizon on eye-level. 90 degrees to the vertical, and that horizon goes all the way around the observer. You have to think 3 dimensional. If the camera would turn around 180 degrees, there would be the very same horizon on the very same eye-level. It's all the way around 360 degrees, so of course there is no curve. Try to complete any of those optical curves and put it on a globe, then it becomes obvious. There is no actual physical earth-arc in your field of view. It's optical on the footage only. Always complete that arc, it is a dimensional absurdity. It's all either the optics of the camera or the haziness of the whether.