You can try this yourself, you might need to travel a little but trust me it's worth it. Go to a beach on the west coast of any country, lay on your stomach on the sand close to sunset time, looking at the sun over the water. When you see the last slither of the sun go away, stand up quickly. I guarantee you will see the sun a second time, because it has gone over the curved edge of the horizon. I'm not trying to be rude, but if you want to have your view seriously challenged, try it.