All ye need to refute Earth's factual flatness is one long rope horizontally held above msl between two distant points in the Sea !
Or you can watch a ship drop behind the horizon, watch the movement and size of the sun, watch the movement of the stars etc.
I do ponder the dualistic Creation of Heavens and Earth, the circle in the square. And I did watch ship
" class="bbc_link" target="_blank" rel="noopener noreferrer">s appear to vanish beyond the convergence line (aka. the horizon). Matter of fact is, you can make them reappear again by simply
" class="bbc_link" target="_blank" rel="noopener noreferrer">zooming in !
In other words, floating things (like boats, birds, &c.) don't "sink" behind the indiscernible convexity of your imaginary ball-earth, you silly Globite ! They simply cease to be visible once they reach a point in distance beyond your limited range of view, as marked by the horizon. The same goes for the floating luminaries and stars, though on a whole different, larger scale.
Since you're situated on the terrestrial plane, objects moving away from you will gradually disappear out of sight from down upward, as if consumed by the convergence line.
Is there any specific reason you want to use a long rope when there is a myriad of other observations readily available?
Yes
Beside being a valid experiment,
one that even little girls can understand,
Globots can't possibly claim that the rope bends above and against the undetectable convexity of water, since no matter the distance, these - the straight rope and flat waters - will never meet ! Consequently, this exp. will conclusively confirm FE and prove once again that your dream-bubble has no basis in sense experience. The end .
Why do scientists at NASA's dryden flight facility assume a FLAT NON-ROTATING EARTH in their equations, if it's indeed a tilted, whirling, rotating ball ?!
— Oversimplification my A**
Why would an aircraft care about the shape and rotation of the earth?
Because, according to your psceudoscientific faith-based organised religion (heliolatry/helios-centrism), it's supposed to be traveling within the atmosphere of what ye claim to be a tilted, whirling, rotating oblate spheroid that somehow holds oceans of flat water, no
Mind you, equations mean absolutely nothing if they don't represent Reality.
Tesla understood this simple fact.
Stop living in denial :/