An appeal to the minority is a logical fallacy that occurs if something is regarded as true just because it is against the view of most people.
Appeal to the minority is common in flat-Earth communities. They think they are right because of their smug “bravery” to resist the majority view. They incorrectly claim that people believe it like a dogma, with no scrutiny, and belittle them with remarks like “sheeple.” In reality, a good argument —like Earth is a sphere— stands on its own and does not rely on the number of the supposed “believers.”
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Because of inertia, we cannot travel to another location by hovering inside a helicopter and waiting for the Earth to rotate below us until we are above our destination.
Flat-Earthers claim that we cannot do such a thing as ‘proof’ of a motionless Earth. In reality, when still on the ground, the helicopter is already moving at the same velocity as Earth’s surface.
Continue reading “Hovering Helicopter and Earth’s Rotation”
The sunlit part of the moon is far brighter than the stars in the background. But cameras have dynamic range limitations. They cannot capture extremely bright and extremely dim objects at the same time. We can increase the exposure to reveal the stars, but then the moon will appear washed out, with no visible details.
Flat-Earthers use the lack of stars in photos taken from space to dismiss them as fake. In reality, the reason for the lack of stars is the same reason stars are also missing in photos of the Moon taken with the correct exposure.
Continue reading “Camera Exposure Settings to Capture the Moon and Stars”
At a lower altitude, the air density is lower, and falling objects are accelerated faster. Conversely, the air density is higher at a higher altitude, and falling objects are accelerated slower.
Flat-Earthers deny gravity and invented the “explanation” that an object falls only because it is denser than the air surrounding it. But if it were true, an object should fall faster at a higher altitude where the air density is lower, but it falls slower instead. This fact disproves flat-Earthers’ density theory.
Continue reading “Density vs Free Falling Acceleration”
The Allais effect is the alleged anomaly of pendulums or gravimeters, which is purportedly observed during a solar eclipse. The effect has not been able to be consistently measured and was most likely caused by experimental error.
Flat-Earthers use the Allais effect to dismiss the result of Foucault’s pendulum. In reality, the Allais effect is still not conclusive. Even if it is true, it only occurs during an eclipse and does not rule out that the pendulum’s precession is due to Earth’s rotation. Not to mention that there is plenty of other evidence that Earth is in motion.
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Implicit attitudes are unconscious influences such as past knowledge, perception, or memory that influence a person’s attitude, even though they have no conscious awareness of the influences.
Many flat-Earthers —especially new ones— seem to be unaware that by believing flat Earth, they are implicitly accusing others of malice & wrongly consider it just another harmless belief. They can be made aware by telling them it is impossible to believe flat Earth without accusing many common people around us —like scientists, pilots, surveyors, etc.— of conspiring. But once aware, it is often still difficult for them to get rid of the influence.
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Flat-Earthers copied the shape of the azimuthal equidistant map centered on the North Pole and claim it as their “flat-Earth map.” The real azimuthal equidistant map is not the so-called “flat-Earth map, and not necessarily centered on the North Pole.
On the azimuthal equidistant map, all points on the map are at proportionally correct distances from the center point, but only from the center point. Other distances are distorted.
Continue reading “Center of the Azimuthal Equidistant Map Projection”
With careful planning, we can easily observe Earth’s curvature from an airliner. To “explain” the observation, flat-Earthers invented the excuse that it is caused by the distortion from the shape of the airplane’s window.
In reality, all camera lenses are curved, too, yet most of these lenses produce normal, rectilinear images. The fact that the shape of the window is curved does not mean looking through the window will produce a curved horizon.
Continue reading “Curved Airplane Window and Observation of Earth’s Curvature”
Visual albedo is the measure of the reflection of sunlight out of the total solar radiation received by an astronomical body, taking into account only the visible light. The visual albedo of the Earth is 0.37, and the Moon’s is 0.12.
The Moon appears dark if the Earth also appears in the same photograph. Flat Earthers use the fact to dismiss such photos as fake. In reality, the Moon’s brightness in a photo is just a matter of choosing the correct camera exposure. But if Earth is also present, increasing the exposure will make the Earth appear too bright.
Continue reading “Visual Albedo of the Moon and the Earth”
Just asking questions is influencing the audience by framing the assertions as questions rather than statements.
Just asking questions is a common flat-Earthers’ ploy. These are not questions being asked out of genuine curiosity but statements disguised as questions. They are not seeking the answers and expect nobody will be able to answer them. If someone can give the answers to the questions, they will not appreciate it.
Continue reading “Just Asking Questions / JAQing-Off”
Glare can appear around light sources, causing them to appear larger in a photo. The higher the exposure value of the camera, the larger the glare will appear on the resulting photo.
Much flat-Earth misinformation arises from misunderstandings about photography, such as about glare and how to eliminate glare by changing the exposure or by using a solar filter. Using the exposure setting for everyday scenes to capture a photograph of the sun will give us a glare around the Sun. To take a photo of the actual size of the Sun, we need to reduce the exposure, either by changing the in-camera exposure settings or by using a solar filter.
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A full moon can only occur if the Sun is directly opposite the Moon in the sky, and it will never appear near the Sun. There are photos on the Internet showing a full moon next to the Sun. These photos are fakes, and the phenomenon cannot possibly occur in the real world.
Flat-Earthers discovered images on the Internet showing a full moon next to the Sun, and they use it as “evidence” that moonlight is not reflected sunlight. In reality, these people are not aware that these photos are obvious fakes.
Continue reading “Images of Full Moon During Sunset”
A frame of reference consists of an abstract coordinate system and physical reference points that uniquely fix the coordinate system and standardize measurements. Speed or velocity is relative to a specific frame of reference. It is possible that two speeds/velocities are measured relative to a different frame of reference and thus cannot be directly compared.
Flat-Earthers like to compare two different speed measurements like an airplane moving at 900 km/h (560 mph) and Earth’s surface near the equator at 1674 km/h (1040 mph). They would conclude the airplane should not be able to catch up with Earth’s surface and would not land if the Earth is rotating. In reality, both the speeds are measured relative to a different frame of reference, and therefore, cannot be compared directly.
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The Apollo missions brought back moon rocks to Earth. Some of the moon rocks Apollo 11 and Apollo 17 brought back were gifted twice by President Nixon to 135 countries. In the Netherlands, both of these gifts are intact and preserved in a museum. However, there is another unrelated gift, in the form of petrified wood that was mistaken to be a moon rock for several years.
Flat-Earthers use the petrified wood incident to discredit the Apollo missions. In reality, the incident is not related to the two moon rocks that the United States officially gifted to the Netherlands, which are still displayed in Museum Boerhaave, Leiden.
Continue reading “Fake Moon Rock That Turns Out to Be a Petrified Wood”
The Georgia Guidestones is a granite monument in Georgia, United States. In one of the stones, a hole is drilled through that points to the north celestial pole. And consequently, by looking through the hole, the star Polaris is visible at night.
Polaris is visible through the Georgia Guidestones’ hole every night, and flat-Earthers use the fact as “evidence” that Earth is stationary. In reality, due to Earth’s axial precession, in a few hundred years, Polaris will have moved far enough away from the north celestial pole and will no longer be visible through the hole.
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False balance is a bias in which journalists present an issue as more balanced between opposing viewpoints than the evidence supports. False balance spreads misinformation because it gives the impression as if the two sides are worthy of consideration.
Flat-Earthers often complain that the media does not give them equal treatment as they do to scientists. In reality, presenting proponents of pseudoscience as being on equal footing misrepresent the reality of the situation and will only spread misinformation.
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Flat-Earthers often show us images of a lamp illuminating a dark wall to demonstrate —incorrectly— how night can happen on a flat Earth.
In the images, the areas farther from the lamp appear dark. Due to the inverse-square law, areas farther than the source of light receive less light. However, these areas still receive light nonetheless. From these dark areas, the lamp is still visible. This contrasts with what happens at night, that sunlight is nonexistent and the sun is not visible.
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DSCOVR is a spacecraft positioned in the Lagrangian point L1 between the Sun and Earth. It carries the EPIC camera that continuously takes images of Earth in 10 wavelengths from 317nm to 780 nm in rotation.
The Moon can appear in EPIC images, and flat-Earthers incorrectly use the color fringing around the Moon to dismiss the images as fake. In reality, the full-color images are composite of three single-color images taken in consecutive exposures in a one-minute span. As a result, the Moon had shifted in the time span and not perfectly aligned in the different exposures, causing the color-fringing after the images are composited together.
Continue reading “Lunar Transit Images from DSCOVR-EPIC”
Far-fetched hypothesis is a logical fallacy that occurs when someone offers a bizarre and far-fetched hypothesis as the correct explanation without ruling out more mundane explanations.
Every time flat-Earthers “discover” a natural phenomenon that they feel “strange,” they will act as if they are the first humans to know about it and then try to find ways to use it as “evidence” of flat-Earth. In reality, it is far more plausible that other people already know the phenomenon and its scientific explanation, and these flat-Earthers are just unaware of it.
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Because of a perspective effect, an observer in space can see more of Earth’s surface if they are farther from Earth.
Flat-Earthers noticed the different visible Earth’s surface in different Earth images and used it to “prove” they are fake. In reality, it is just a perspective effect caused by the fact that the Earth was seen from a different observer distance.
Continue reading “Perspective of Earth Due to Different Observer Distance”