Not if the sky above / around us had different refractive indexes giving us the illusion of a spherical style sun set.
Based on what composition of the atmosphere.
Two. We are posting about why the sun is physically blocked from view.
Three. It is impossible for the “ground” of a flat earth to block the sun at sunset to creat night.
Tides can be explained by gentle movements inside the Earths crust.
What such movements. And why do tides correspond to the movements of the solar system inline with the measured gravitational forces exerted by the bodies of the solar system.
For example a vicious movement like a sudden earthquake can cause a tsunami.
Again. Has nothing to do with why tides are predictable and are predictable based on movements of the solar system.
And has no explanation why tidal bores cause rivers to run backwards.
And you completely ignored hanging spring scales work in accordance with Hooke’s law and gravity.