[quote]"Well", you might ask, "If the Earth is Flat, and the sun, moon, planets, and stars are all smaller and orbit above its surface; how does an "orbit" even work in the first place?" The UA to acts on any given object dependent upon an its surface area and propulsion. For very large objects (like the earth or the sun) extensive surface area allows the UA to act, moving said objects upwards at a constant rate. For smaller objects (like airplanes or birds), a given amount of propulsion proportional to surface area is necessary for the object to be acted upon. An orbit is caused by the UA. The sufficient surface are of the sun, moon, planets, and stars (even though they are smaller and closer), is enough to be acted upon by the UA.  [/quote] https://flatearthandthought.com/2017/01/17/question-if-gravity-doesnt-exist-what-holds-us-down/

Ah. But I still don't understand how it would be 6pm at Britain and 10am somewhere in USA on a flat earth...

Time zones are relative constructs imposed by people. Time zones work just the same on a Flat Earth. It just depends on where the sun is at any given moment. The above gif very crudely represents how the sun orbits above earths surface...