flat earth

  1. R

    Claim: Moon's terminator as a evidence for distant sun

    Hi friends. I kinda believe in Flat Earth, to be honest, I don't have too much mathematical and geometric knowledge but i am willing to learn more about everything. I'm open to many ideas and I like to understand all propositions and see if they make sense to me, and I don't get too attached to...
  2. B

    Debunked: Video claims to show that perspective is non-linear [Table not flat]

    A flat earther showed me this video where Eric Dubay builds a small scale model consisting of block towers of the same size, and from a certain angle it does not appear to obey linear perspective, and the block towers appear to curve downward, despite apparently being in a straight line on a...
  3. A

    Geometry question about the radius of star trails

    I have a project going related to Flat Earth debunking, but I want to get some geometry right first. It is commonly observed that star trails near the poles are circles, while a star trail right on the celestial equator is a straight line, since it is a great circle on the celestial sphere. I...
  4. I

    Debunked: "Celestial navigation is based on elevation angles from a Flat Earth"

    Some youtubers claim that celestial navigation is based on elevation angles from a Flat Earth. For example: https://www.youtube.com/c/NathanOakley1980c/videos Not only is celestial navigation allegedly based on a Flat Earth, it works so well that it amounts to proof that the earth is flat...
  5. S

    Debunked: Mt San Jacinto observation does not matches with Earth's curvature

    An important clarification before we begin: my idea here is not to debunk the author's entire line of thought (which I of course disagree with), but rather to refer to a very specific statement made in the following video: Source: https://youtu.be/v0udDmzdERM (The claim starts aprox at 08:39)...
  6. Agent K

    Geogebra tool to compare distances on a Flat Earth with a Globe

    This looks like a neat tool. I don't know who made it or how accurate it is, but it says the distance from Australia to New Zealand on a flat Earth would be 3526 miles, compared to 1309 miles on a globe. https://www.geogebra.org/m/CMZMru7g So I compared that to the length of the Tasman Global...
  7. V

    Needs debunking: flat earthers claim this reflection to show a harness in ISS video

    This is a clip from the video of Megan McArthur and Thomas Pesquet answering questions of kids: Source: https://www.youtube.com/watch?v=y_XB4j4vVXo At one point (2:00) Thomas attachs the tablet to the back wall and later when he jumps down (16:20), the tablet shows a reflection of something...
  8. S

    Help: Panorama Maker and the Curvature of the Earth

    Hi everyone, this is my first time posting such a thread. Hope to get it right, in case I make any inaccuracies regarding the posting guidelines please let me know. With that said, I begin: Many here at Metabunk, and even more so on the Flat Earth forum, will know that Panorama Maker...
  9. Code-Beta

    300 miles visibility on Antartica?

    I found a strange thing in goverment document named "Sailing Directions (Planning Guide and Enroute)". It says that mountains were sighted up to 300 miles away. Assuming observer is at "Crow Nest" at 115 ft ( 35m),Refracted hidden will be 8.83 miles. The highest mountains on Antarctica are 2.9...
  10. H

    Illusions of Curvature - RC Boat Hidden on Small Pond

    I found an interesting video which shows an RC boat with a flashlight moving away from the camera, eventually disappearing below the horizon. This "test" however was conducted at a relatively small pond, no more than 600 feet in diameter. This is simply too small to allow for any curvature...
  11. Cassi O

    Google Maps Measure Distance Using Great Circle

    Nearly everyone making videos showing something over the distant horizon, (including all those videos claiming the earth is flat), use a program like Google Maps to measure the distance. This under 3 min video demonstrates how Google Maps calculates the great circle distance on a globe, not a...
  12. Wiggles

    Refraction Variations Over Water to Bell Island

    For fun I'm doing a lot of long distance observations across the ocean. A flat earther made an excellent point on one of my videos: Source: https://www.youtube.com/watch?v=xtHPqxiscYw&lc=z222wpz4jsnagxygy04t1aokgvojlxjibrylwy0f5g35rk0h00410 (The image below is from #13 and #12 respectively)...
  13. Mick West

    Demonstrating the Curve of the Earth with observations of Beachy Head from Worthing

    Source: https://www.youtube.com/watch?v=9fJBrCs6VXM In this video a Flat Earther called "Dr. John" shares his observations of the coastline from the Southern English town of Worthing. He correctly identifies some landmarks along the way, but then it all goes wrong when he claims to be able to...
  14. Mick West

    Why Flat Earth Laser Tests are Misleading

    Source: https://www.youtube.com/watch?v=ookTfBP5sUU When you shine a laser beam across the surface of a lake, it is very prone to refraction, but often this is ignored, and the result is declared a victory. Laser tests are a very poor choice of a test of curvature, when much clearer (and...
  15. Rory

    Calculator for viewing angles

    Please find attached an excel spreadsheet containing a calculator which works out the viewing (elevation) angles for an observer of a given height on both a flat and sphere earth, from distances and elevations. This is what it looks like: For the flat earth, it's simple trig - tan(x)=(target...
  16. Rory

    How can we explain perspective calculations simply?

    Perspective is difficult, both to understand and to explain. This was recently brought home to me listening to flat earthers Nathan Oakley and Anthony Riley attempt to explain this photo of mountains in Washington and Oregon: All decent analyses show that it aligns perfectly well with a globe...
  17. Mendel

    Debunked: Air Map of the World 1945 is a flat Earth map

    https://planetruthblog.files.wordpress.com/2017/03/16298924_374575762915001_5952359865149692457_n.jpg https://aplanetruth.info/2017/06/28/1945-british-military-flat-earth-map/ 1945 British Military Flat Earth Map Uncategorized June 28, 2017 Comments: 11 Includes Flat Earth Air routes and...
  18. Mendel

    Homemade Gyrocompass finds North by Spin

    The gyrocompass was invented before WW1 and sees service on every submarine and big iron ship, where a magnetic compass would be unreliable or useless. An aquaintance of mine who attends naval school confirmed this for me. He also reported that a ship's gyrocompass takes several hours to start...
  19. brad fuller

    Does the inverse-square law apply to the flat-earth debunking tool chest?

    My google-fu has let me down on this one, so I'm asking the smarter crowd! I'm familiar with the inverse-square law as it applies to light fall of from a idealised spherical / point source, and I use this info (in practical terms) for flash photography, so I'm good on the basics. One obvious...
  20. Rory

    Earth curve calculator for obstructions

    I've been working on a calculator that outputs the predicted visible amount of a distant landmark when there's an obstruction above the horizon, such as a view over terrain with a ridge or intervening mountain. It seems to be working pretty well, and I'd say it's just about finished, but I have...
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