Mirrored with permission from Movie Vertigo.
Please check out his channel which has numerous excellent videos.
This simple demonstration shows that from low elevation – e.g. standing on a Beach the Horizon will look flat on a Globe
I will be doing a follow up looking at the geometry in detail explaining exactly why the Horizon will look flat on a Globe.
Flat Earthers often confuse this flat horizon appearance as evidence of a Flat Earth. That is incorrect because a flat Horizon is exactly what you will see on a Globe too.