Just Supposing -Earth is a Flat disc-albeit circular, rather like a big dinner plate or better still maybe a clock. (as i've mentioned elsewhere, somewhere)London say is at 6 o'clock, New York is at 9 o'clock, Australia is 12 o'clock, Asia/Europe 3 o'clock, then back to London at 6 o'clock. Therefore any moving object be aircraft or ship going off on a world tour would in effect be going around the world as it's still a circular motion, even in an east-west direction. It would still be possible for satellites to be up there going round and round, but moving around a circle, like traveling around the outer rim of the circular clock or dinner plate as it were? I reckon a test might be if any aircraft can fly over the antarctic? which i read somewhere hasn't ( on a flat-earth the "antarctic" circles the world on its outer rim. ) Anyway just a thought

Ps. Re: "Others have.
How do you know Australia exists if you have not been there?"End Quote.
Exactly, we as individuals can believe or disbelieve Australia exists (if we haven't been there) But we can research, we can talk to those who have been there or even meet Australians, they can tell us how we get there, show us photographs (and not mere drawings/paintings) we can believe/disbelieve them, weigh up what evidences exists to support what we're told and learn. and we can save up enough money and go there for ourselves. We'd know without doubt a land called Australia actually exist. None of us can take off to the moon to check. My statement was merely an example of swallowing without question what the telly or the radio tells us. Especially by authorities running the world.