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I feel I've reached a new level with regard to the OP question. I'm almost starting to think it's okay that people believe the Earth is flat, and that I mostly want to leave them to it. That's not to say I don't want to debunk it - the puzzles are pretty interesting sometimes, and I've learned...

That's a beautiful graphic, thanks for doing that: looking at the difference between Olallie and Mount Rainier, which both appear at the same apparent height in the photo, really illustrates the point perfectly. :) If you wanted to do one for how it would appear on a curved earth, the quickest...

Oops. In the very first image in this thread I included the observer location but actually wrote in the coordinates for one of the mountains. Silly me! Here's the image corrected:

Here is a lovely shot of mountains in Oregon and Washington taken from the summit of South Sister in January 2007: Source: https://www.flickr.com/photos/rhane/372202821/in/photostream/ The summit of South Sister is recorded as being ~10,360 feet above sea level (plus or minus 3 feet...

Wolfie6020 is a well-known flat earth debunker on YouTube and Qantas pilot. Here's a still from a video he posted flying at 46,000 feet: Source: www.youtube.com/watch?v=9DDwx18JT9Y It seems almost academic to apply the compression technique to something that shows the curve of the earth so...

Is this an interesting idea, similar to Canigou? The beach at Carlsbad in California is just the right distance away from Santa Catalina Island to hide the tallest peak: 64 miles, which should just about exclude Mount Orizaba (at 2,097 feet). Another nice feature of Carlsbad is that, around...

While this is only using one water level, rather than two joined together, it looks pretty good to me. But would you say that's inadmissable?

If Twain said nothing in no forest and no one was there to hear it...would it still get made into a meme?

You guys! Why didn't anybody tell me that I needed to add refraction to all these angle calculations? It's almost as if you hadn't read everything, or opened all the spreadsheets, or double-checked my findings. ;)

(You can only imagine how much it kills me to post a meme with a spelling mistake in it.)

I think what Mick meant was that it's difficult to get a good and clear result by doing it close to water, rather than actually difficult to carry out, as this is where observations will be most affected by refraction - the same problem that scuppered Rowbotham on the Bedford Level. The globe...

I'd estimated that 4,000 feet of predicted viewable mountain on the hypothetical flat earth by using the handy elevation profile tool on Google Earth and drawing a tangent line across the highest ridge: The other way to do that would be to use a bit of trigonometry and play with right-angled...

That's an interesting way to arrive at the visible amount of the mountain. Kinda cool that it's the same that I estimated using peakfinder, and that Nick has also now agreed is what we're actually seeing: I actually think your "crude estimate" is pretty much spot on. The reason we're not...

This recent paper might be interest to you pyramid fans. Main author is from the University of St Petersburg. Published in the Journal of Applied Physics: Propagation of electromagnetic waves inside the pyramids of Cheops at different lengths of radio waves (from 200 to 400 meters). The black...

I think given that the line of sight is pointing right at the Phare de Chassiron, and the Phare de Chassiron is a lighthouse with a powerful white light, and the light in your photo is white... It's the Phare de Chassiron - and maybe the wikipedia entry needs updating to say "its light can be...

To see the very top of a 50m structure 57.44km away one would have to be 61m about sea level, according to the curvature calculator. But is seeing the light the same as seeing the structure? On the wikipedia page for the Phare de Chassiron it reads: Today the lighthouse lamp operates with a...

Line of sight for the distant lighthouse: Looks like it agrees with the image in the OP as far as alignment with the rocks goes.

So a time and date for the photo to see where the tide was would be useful, I guess?

Were they taken from Le Prieuré Saint Nicolas (Saint Nicholas's Priory) at 46.489942, -1.794633?