Anonymous
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I shouldn't answer this, this is top secret CIA information but if you walk to the top of the world, the North Pole carefully estimating your position by compass, ruler and pencil and paper.
Then live for a month there off the land examing your landscape.
Then walk south carefully counting your footsteps as you go examining only one side usually west since most are right handed, you will see the flat plane of the flat Earth we live on..never look east!
And when you discuss it you will swear all rumors of a round Earth completely fake. Without a doubt.
BigBird
If you observe a large smooth body of water with a good pair of binoculars, you can see the curvature of the surface.
zipper
HOT AIR BALLOON!
Jeffrey K
If you know someone who lives directly north or south of you, call him and tell him to put a vertical stick in the ground on a sunny day and measure the length of the stick and its shadow. . You do the same with the same length stick at the same time. The difference in shadow lengths indicates the earth's curvature. You can even calculate its radius.
Ronald 7
The higher the better
Or if you live beside the sea like me
You can watch ships sailing over the horizon, which is actually 11 miles away
the last thing to disappear is their funnel
You can ask yourself, why does the Ocean curve when it is water ??