Well I plugged it in and it sounds like the flatheads are a deeply disturbed and disturbing religious cult - total fanatics for sure.  I'd definitely stay far, far away - about the same distance I'd keep sedevacantists!  Wait, I am a sede these days... and I'm starting to lean toward flat earth...  help!!!

Yeah, by not deleting my innocent post

I'd say "Welcome back," but I cannot feign such niceties.

Address the ideas and arguments put forth in the video, or choose to not do so. 

As for the video, it is excellent. Thank you, Matthew. 

Here are my top proofs ...

1) Dr. John D two-way laser experiment
    REASON:  100% eliminates the possibility of "refraction", the only deus ex machina retort Globers have against the "see too far" experiments.  In order to have downward refraction, you would need continually-increasing density gradient.  But if you have continually-increasing density in one direction, it would be continually decreasing in the opposite direction, causing that laser to refract up and out of view, which is absolutely impossible given that the lasers were on a line within 10 feet of each other.  Was also pre-announced, streamed live, and witnessed by others.

2) Ice Lights experiment
    REASON:  "refraction" is nearly impossible in such cold/frozen conditions since the air is capable of holding very little moisture at those temperatures

3) Distance Records from long-distance line of sight transmission mechanisms
    REASON:  Neither of these experiments was conducted by Flat Earthers, so that one could claim an agenda.  Most compelling are the world-record microwave transmission across the Mediterranean (boasted of by the company that achieved this), transmitting broadband data using microwaves that are 100% line of sight, over 200 miles.  In addition, there was a recent UHF transmissions detected 8 miles away, with another line of sight transmission mechanism.  Add to this the WW2 German technology that could only have worked line of sight, and the US radar triangulation technology, which also could only work line of sight.

4) J Tolan Photogrammetry and Infrared Photography
    REASON:  Photogrammetry software is known to be highly accurate in creating 3D representations of visual data.  Using top-end photogrammetry software, J Tolan fed infrared pictures taken across hundreds of miles of a flight into the software, which indicated that the earth was 100% flat over the course of his journey.

5) Long Distance Photography records
    REASON:  performed by individuals who are not flat earthers (unaware of the implications of their videos) and verified for the purposes of the records.  One showed the Alps from 700 miles away, which should have been hidden under 85 miles of curvature, and another a lighthouse about 150 feet above sea level from 230+ miles away, which should have been hidden by about 15 miles of curvature.

6) Dr. John D "Black Swan" wind turbine video
    REASON:  Dr. John D's wind turbines line up perfectly as they would be expected giving the lines of perspective, which would be impossible unless the amount of refraction was absolutely consistent for the entire 11 miles between him and the farthest wind turbine.  Refraction between mile 11 and mile 10 would have to be identical to the refraction between mile 10 and mile 9, etc. ... for 11 miles.

7) Video showing sun shrinking in size
    REASON:  Video taken by a soldier in Afghanistan (not a flat earther) in very dry desert conditions shows the sun getting smaller, almost disappearing to a dot, as it got farther away.  If the sun were 93 million miles from earth, it would only shrink by a fraction of 1% in size as it moved around the earth.  But the sun went from very large to the size of a dot before disappearing.  There's no possible explanation for this.

8) Amateur Balloon Video from 120,000 up
    REASON:  all mathematical models indicate that the horizon line should drop significantly at that altitude, but the horizon line remains at eye level.  Also, if you see how high the 120,000 feet is, that is the same degree of curvature one should see from one end of Kansas to the other, so the curvature would absolutely be noticeable at that altitude.  These videos are the reason that Neil de Grasse Tyson had to debunk the RedBull jump's wide angle lens and claim (falsely) that at 120,000 feet "that stuff is flat".  No, the curvature should be very visible at that altitude.  So they had to throw "RedBull" under the bus to salvage globe earth.  This is despite the fact that Globers had regularly claimed that curvature is visible from the 30,000 feet that commercial airliners usually travel.

Dubay's concluding monologue is well worth a listen.

Now, the one proof I haven't seen before is the distances between lines of longitude in the Southern "hemisphere"; this is very important and needs to be explored more.

I have in person seen the sun cast shadows of the landscape up onto clouds, and illuminate the under side of clouds from below ...

False.  This has been debunked, including recently by a professional engineer.

There are things that are much more worth while to put you repeated effort into, maintaining clean and at surface threads for. WW3 is just beginning and you're worried about what shape the planet is?

Oh, only untold millions of souls have lost the faith due to modern science, between the Big Bang, leading to evolution, old-earth cosmology, etc.

If it doesn't matter, why are you so hostile to it, eh?  You should just blow this off and post on the WW3 thread.  It doesn't matter, but you spend significant amount of time posting (albeit with zero substance) against Flat Earth threads.  If it didn't matter, then the Flatness of the earth shouldn't matter to you.  But somehow it does, eh?

Here's the famous Redbull jump.

Flat Earthers say it's a fisheye lens.
Globe Earthers say it's photographic proof of the curve. 

But here's the problem -- look at the altitude he's at when the "curve" starts. Look at the "earth globe". This meme sums up the issue BRILLIANTLY.
I'll give you a hint: complete the hypothetical "globe" or "planet" based on the curve you see in this photo. Apparently the Globe Earth is only big enough to fit a few US states!