flat earth

  1. Mick West

    How to Verify Your Latitude and Longitude to Show the Earth is A Globe

    Any position on the surface of the world can be represented by two numbers: latitude (the north or south angle from the equator) and longitude (the east or west angle from the Prime Meridian in England). These two numbers are generally referred to as coordinates. In the past you might have said...
  2. Mick West

    How to Verify that the Sun is a Distant Sphere, with Binoculars & Sunspots

    From past the orbit of Mars, the solar system looks a bit like the above. Earth is just a speck, not even visible here (at the end of the blue line). The sun is much larger than the earth, yet still seems small and far away. Its light shines equally in all directions. Can we actually verify...
  3. HoaxEye

    How to calculate the visible fraction of the Earth [e.g. 1972 Blue Marble, Apollo 17]

    This question originates from a YouTube video called "NASA Blue Marble 100% Debunked" by Flat Earth Asshole (pardon the language, but that is their channel name). In the video, they make a claim that NASA's Blue Marble photograph from 1972 is a fake because it is not a correct representation...
  4. Mick West

    A DIY Theodolite for Measuring the Dip of the Horizon

    A theodolite is a relatively simple instrument for measuring vertical and horizontal angles. It's commonly used for surveying, but you can also use one to get a rough estimate of the curvature of the Earth by measuring how far the horizon falls below eye level from different altitudes. Modern...
  5. Mick West

    Stand Up to Detect the Curve of the Earth

    A surprising fun science fact is that the curve of the earth is detectable simply by standing up. This works best with the surface of the ocean or a large lake, and it's something you can easily do at the beach. I recently gave it a go in a visit to Venice Beach near Los Angeles. With my Nikon...
  6. Mick West

    Views of Toronto from Hamilton and Fort Niagara Illustrate Earth's Curvature

    When people want to practically illustrate the curvature of the Earth, they often give the example of a boat disappearing over the horizon. While the boats example is perfectly valid, it's quite hard to observe and the effects of refraction make it confusing to interpret. It's also hard to...
  7. Mick West

    Calculating the height of something in a P900 photo when distance is known

    The following discussion has a error in that it was assumed the field of view was the same at long distances as it was at 8m. In fact the field of view narrows with longer focus. This alters the scale factor from 0.02 to 0.01737 for a P900 at full zoom and focussed on something over 100 meters...
  8. Provemewrong

    Explained: Why flying isn't impossible on a globe

    The earths curve is approximately 8 inches per mile squared. With planes flying at 500mph, the earth would curve beneath them around 31.5 miles every hour. In order for the plane to keep up with the curvature and not steadily head towards space, the plane would have to descend 2777 feet per...
  9. Mick West

    Review: Flat Earth - The History of an Infamous Idea - Christine Garwood

    The idea of a Flat Earth is firmly at the far end of the conspiracy spectrum. It's an extreme conspiracy theory because the belief requires that you accept that the entire space program is a fake, designed to cover up hundreds of years of an even deeper scientific conspiracy to hoodwink people...
  10. Mick West

    Where and How could the Wallace Experiment Easily Be Repeated?

    A classic demonstration of the curvature of the Earth was performed by Alfred Russel Wallace in 1870: http://blogs.scientificamerican.com/rosetta-stones/wallace-8217-s-woeful-wager-how-a-founder-of-modern-biology-got-suckered-by-flat-earthers/ The iron parapet of Welney bridge was thirteen feet...
  11. Rory

    Debunked: Eric Dubay "Flat Earth Proof" #13

    SPOILER ALERT: This post is very boring, and mostly pointless: not even flat earthers use this 'proof', and Dubay seems to have gone somewhat out of fashion, but I include it here because: a) I did the research already; b) others debunking his list on their blogs hadn't quite figured this one...
  12. Bass In Your Face

    Curvature Experiment showing relation between x-axis and z-axis

    Hey guys, I decided to whip up this experiment at my shop when somebody questioned a graphic of mine that I created to help demonstrate the horizon of a sphere the size of the earth, by zooming in it and showing the FOV. This was the graphic: (Yes I wrote in the wrong FOV for the last pic :/...
  13. Sandor Szekely

    Atmospheric sunlight refraction arguments on the Eratosthenes triangulation method

    DarkStar presented his measurement using the Eratosthenes triangulation method to prove the globe earth model curvature is right. http://flatearthinsanity.blogspot.com/2016/07/simple-proof-for-convexity-of-earth.html Here is the heart of the proof. Simply pick a line of longitude (along which...
  14. Rory

    Debunked: Rivers flow uphill

    In @ericdubay's "200 proofs" list he claims that rivers such as the Nile, the Paraná, the Congo, the Paraguay, and the Mississippi "flow uphill". The rationale behind it seems to be that rivers which flow from north to south (in the northern hemisphere), or south to north (in the southern), and...
  15. Sandor Szekely

    Lake Balaton Laser experiment to determine the curvature of the Earth, if any.

    This thread documents the progress of planning, execution, and analysis of an Experiment conducted by Sandor Szekely (a believer in the "Flat Earth" theory) on Lake Balaton in Hungary. The goal of the experiment was to measure the curvature of the surface of a lake by shining a laser across it...
  16. Mick West

    Space Station Photos Disprove the "Flat Earth" Theory

    The above sequence of images is the international space station. I took them on Saturday, May 28th 2016, at 9:28PM in the Northern California town of Shingle Springs (near Sacamento). They are not very good, but you can still make out the general shape of the ISS, with the central body, and the...
  17. Z.W. Wolf

    Debunked: Gyro Experiment - Proves Motionless Earth?

    This experiment supports the null-hypothesis (earth is not moving). The experiment is faulty, of course, but I suspect anything I might say about that would be hopelessly naïve. The most cogent comments to this video I could find: Eric Charters2 months ago The gyro appears to precess only...
  18. Vogon

    Infra red cameras and curvature?

    So, this supposedly shows Three Lakeway Center, in Metairie, Louisiana, a 403-foot (123 m)-tall skyscraper from the other end of Lake Pontchartrain Causeway. Curvature should show a 116m drop for that distance, and the buildings around it are lower than 116m. (Google Street, from the...
  19. Chew

    Debunked: flat earth claims about lighthouse ranges

    Flat earthers will quote the height and range of a lighthouse and then claim the light should be hundreds of feet below the horizon at that range if the world were spherical. So therefore the world is flat. But they are assuming the listed range of a lighthouse is the maximum range it can be...
  20. Alec Riz

    Explained: Flat Earth Theory: Why don’t our clocks have to change by 12 hours in 6 months?

    When researching Flat Earth Theory there is 1 claim that I am finding puzzlingly hard to debunk. If the earth is spinning around its own axis, and orbiting around the sun, at a regular speed then, why don't we have to change our clocks by a full 12 hours every 6 months to account for the fact...
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