Who would test the lid of a container by exploding a bomb underneath it? How does gaining evidence of its existence prove the shape of the thing we walk on? Which one is being used to describe something 'in the sky'? What are the definitions of the word firmament? (As per non-photoshopped images from the Red Bull balloon parachute jump.) If he then takes off and flies even higher above the balloon he will lose sight of it as it drops away beneath him, but the actual horizon will still be at eye level no matter how high he goes.

How could it be otherwise? How could there be any curves, lumps or bumps in one part of it and not the other? In my view, lack of curvature on the horizon is not proof of anything.ДЇar more important is that when the fly gets up to any considerable altitude on the hot air balloon ride, he will find that when he looks beyond the circumference of the balloon to the true horizon he will see it's also flat, but he will see it at eye level all the way up.

If you were a fly who was unfortunate enough to find itself on the top of a hot air balloon, your horizon would look perfectly flat throughout it's 360 degree view around the balloon's circumference or local horizon. The business of seeing a curved horizon is also the FE movement's Achilles Heel, imo. Still today there is no real proof of either a firmament or a dome or at least none that has ever convinced me personally. I abandoned the Flat Earth debate years ago precisely because of the pointless fragmentation caused by the firmament and dome movement, which was obviously a deliberate ploy and a successful one as it appealed to the biblical folks.

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