I'm not seeing how that is evidence for a ball earth. Or are you trying to explain gravity? Do you believe that because rain falls downward, this indicates a force of gravity, and that's what keeps the water in place on the surface of a supposed ball earth? ? Or something like that? The problem I have with that is that water on the surface of the earth is very, very heavy, but rainclouds are not.
No to the Bank of Engand and Newton's theory of "gravity". Besides modern physics admitting that it's the "weakest force" and weaker than a little refrigerator magnet, Newtonian gravity's not any lateral force. It doesn't move anything sideways. And the distinction between the vertical and horizontal in a true sphere is arbitrary. So if it's not a lateral force, it's not a vertical one either. Besides that,
weight by itself, which constitutes what one could call Augustinian "gravity" in contrast to the Newtonian, does not constitute a source of motion. They can put a 500 pound anvil in a field and it'll never move, unless something that can move it, moves it.
So if the Moon goes laterally around the Earth, which it does along the ecliptic, it must not be "gravity". It's something else, like "celestial impetus" ...
One thing to consider is where the Sun is at midnight. It's specifically on the opposite side of high noon. It doesn't keep going further west after sunset ad infinitum. It recedes from the straight-line attempt at cosmic infinity, at the end of the day, by curving around in a circle ...
Everything in space is on the other side of infinity, or infinity's on the other side of everything in space, and the full division of sides in two planes is like a cube, and the full rotation of the cube is like a sphere. Divide the day by six hours, and that's like 90 degrees, and there are the four sides of the square of the ecliptic that makes circles in rotation. The poles cut it from another plane for the 3-D roundness and full rotation in the sphere of space.
Raindrops are too heavy to remain suspended in air, and rain falls down to Earth, imho, because it's at the center, from the same reason of evidence that the Earth's in all the signs of the zodiac, in the middle, and under the clouds the same way all the time. The clouds, the stars, and the rain all point in to the Earth. They always will recede from a straight-line attempt at infinity and point in to the Earth out of a curve. It's elemental condensation and Aristotle thought that was how the Earth was formed spherically in the first place, through condensation.