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I have watched this several times at 1/4 speed on YouTube, and I find it very difficult to identify just where the 'UFOs' appear from. As far as I can judge, they are not coming up from the ground; they just materialise out of thin air. Also, I don't see it stated anywhere how high and how...

I expressed the hope that someone would overlay the horizon in the video onto the predictions of Walter Bislin's curvature simulator for the same height, as I didn't have the ability to do that myself. My hope has been more than satisfied, because Walter Bislin himself has done it! In his page...

I suggested that it would be interesting to overlay a shot of the horizon in JTolan's video with the expected curvature from Walter Bislin's simulator. I don't have the tech ability to do this, but out of interest I did the following. First I took a screencap from the video. Using the basic...

I'm glad it wasn't a slip. I hadn't heard of Kelly David. Back here in the UK Dr David Kelly (Iraq weapons expert found dead with his wrists cut) is rather better known, and the subject of numerous conspiracy theories.

This may not be the best time to mention it, but shouldn't 'David, Kelly' be 'Kelly, David'?

As has been mentioned in this thread and elsewhere, it is often said that from the normal cruising height of a commercial airliner - between 30,000 and 36,000 feet - the horizon is usually too obscure for its curvature to be definitely visible. I was therefore interested to see a 'flat earth'...

The FE claim is that no plausible amount of refraction can possibly account for a given amount of 'looming' at a given distance. I think the best answer to this would be with time-lapse video footage showing the allegedly implausible amount of refraction actually happening. For example this...

Could you say which images you are referring to? I checked the Google Earth image in post #21 above using my highly scientific measuring equipment (a ruler), and could not find any difference. (I mean the first image, in which the whole disk is illuminated, not the others, in which one side...

'Miles Davis' has a video up on YouTube today which pretty conclusively identifies the wind turbines seen in the flat earth video. They line up well with the direction of Scaefell as it would be seen from Blackpool beach (as it occasionally is). Miles also uses one of Walter Bislin's...

That's a good article in Deidre's link. Scrolling to the end of the article, it gives quite a clear explanation of why refraction sometimes shows more of the IoM than 'should' be visible from Cleveleys. The Isle of Man Mirage If you are lucky enough to be in the right place at the right time...

Very useful analysis of Rowbotham in Z. W. Wolf's comments above. I agree Rowbotham is probably the source, direct or indirect, of flat-earthers' confusions about perspective. It may be worth mentioning that the passages quoted are from the 3rd and final edition of Rowbotham's book. In the...

I agree that a telescope or binoculars make a big difference, but the model of the sky as a kind of hemispherical dome, with the stars scattered on its surface, and therefore at equal distances from an observer at the centre, predates the telescope by a few thousand years. Indeed, the dome...

I'll second that. The one I can never find is the calculator for 'side-to-side' curvature. I have to search through my old bookmarks for that one. It still exists, but I don't know any way to find it from the Home page.

It doesn't look as though all the stars are different distances I don't know about that. The main visual clues to the distance of the stars are their size and brightness. They differ conspicuously in brightness. We were discussing their apparent size on another thread. While they are...

I recently came across a flat earth argument about stars that was new to me, so it may be worth recording here. I will try to present the argument as convincingly as I can. According to standard scientific doctrine, the following points are true: 1. The sun is a star, and a fairly ordinary...

Well, I see from Wikipedia that Arago was a freemason: https://en.wikipedia.org/wiki/François_Arago That explains everything! But seriously, Arago was a titan of science, one of the greatest figures in an age that included the likes of Ampere, Fresnel and Faraday. Anyone reading about the...

As there has been some mention here of balance scales, it may be worth saying a bit about how they maintain their balance. (There is a Wikipedia article on 'Weighing Scale', but it rather neglects the important issue of stability.) There are many discussions of this in old science texts...

It all looks very promising. On the methods, I note that Wallace used both a telescope and a surveyor's level, the latter at the insistence of the flat-earthers. Theodolites etc. can be hired, see surveyequipment.com/hire/ I'd be happy to chip in if it is decided to use one. Of course they...

Rowbotham's 'logic' is unusual. Unlike many flat-earthers, he seems to accept that if an object is projected upwards from a moving base (e.g. a ship in motion) it will continue to move in the direction of the moving base during the upward part of its journey, but as soon as it starts moving...

As I mentioned somewhere else, some of Rowbotham's reported experiments strain one's credulity, quite apart from any consideration of the shape of the earth. For example see his account here of an experiment with cannon balls fired upwards (text under fig. 49)...