flat earth

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...

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...

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)...

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...

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...

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...

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...

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...

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...

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)...

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...

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...

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...

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...

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...

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...

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...

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...

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...

Recent flat earth hero JTolan has uploaded a video of the moon shot using an 830nm infrared filter, and happened to catch what he says "appears to be a space vehicle in orbit": Source: https://www.youtube.com/watch?v=yCNlYerxPVA From 45 seconds he shows about 20 seconds of it moving across...