Well, you could go spend a day with a local surveyor, and ask to help out on a geodetic survey. They do it day in day out.
Or you could explain why it is you can see further from a mountain top or a tall building.
Maybe just watch a sunset, or sunrise.
The proof of a round earth is right there, you just need to look.
So, these surveying chaps can prove the earth is round? Do bring one here and have him share this elusive information in his grasp. I'll be most delighted to hear his tales.
It's not that you can see farther, it's the vantage point. There are no obstructions of your field of view whilst on a tranquil mountain. Go into a desert, where there is none of that pesky foliage clogging your retinas, and let your eyes wander. You'll see, (no pun intended) things are rather flat, and you can see quite a distance. Hmm, you might say, the same distance as from a mountain. 
I've seen many sunsets and rises in my years, and none of them have shown me a round earth. To my apparently untrained eye, I must say the way the sun comes up lends credence to a flat earth. Much like a balloon rising over a table I believe, if you'll permit the analogy.
How does the sun set on a flat earth?
It goes underneath, you silly goose.
BOOK A FLIGHT TO ANTARCTICA RIGHT NOW.
No thanks, mate.
So... It "Goes underneath."
Meaning the entire Earth would go dark simultaneously, as it would be BENEATH the Earth at that point.
Uh... Nope. That's not how that works. See, there are these things called "Time Zones," and that dictates that when it's daylight in one place, it's night in another. Very basic concept. Don't have to be "Scientific" to figure that one out, just ring someone up or start a Skype chat with someone on the opposite side of the world from you.
There is no way that model works with reality.
Sorry, Them's The Breaks, Kiddo,
~Xenos, Going to Bed, Have Fun Y'all!
Didn't think I'd need to clarify for one that perceives himself to be a great scholar, but there are at least two suns. Surely you've read about all the "theories" we FE'rs believe. Oh, what's that? You didn't bother to study before you came here with your condescending attitude? My mistake. 
You seem rather blissful in your ignorance, but I do suppose that is what they say...
Well, I read the FAQs, I've read several threads, and I've watched a crapload of YouTube videos. None of them have brought up a "Two Sun" model. One guy DID say a "Black Sun," which he also labeled as Niburu. Most of the FE theories I see say the sun is 3000 miles up, 32 miles in diameter, and shines like a spotlight, but never actually goes UNDER the Earth. So the insults about my not studying something first, I would say I'll wait for a retraction, but at this point I realize you're a troll, and a very poor one.
Also, I don't perceive myself as a "Great scholar." I look up to and respect Alexander III of Macedon (i.e. "Alexander the Great."). Last I checked, he was Emperor of the World, not a scholar. His TEACHER, Aristotle, was. And he has been reported to have said "Were I not Alexander, I would wish to be Diogenes," who of course, is the founder of Cynicism.
But, I thought having a picture of Alexander, quotes from him as my personal text and my signature would be quite enough to get that point across. Hrm, didn't realized I'd have to explain it to someone so "enlightened" as to be able to talk down to anyone who don't know THEIR particular interpretation of the Flat Earth model, one which I should add, is either unique to you, or so roundly unaccepted (yes, that's a pun) by the majority as to not get a mention in this site's FAQ, most pages on it I've been able to google, or in ANY video of people trying to prove their point.
Ah well.
Most Certainly NOT a Scholar, Nor Do I Claim to Be,
~Xenos, Taking my Hat in my Lap and I am GONE (to work)