The mass of the Earth exerts the gravitational acceleration of about 9.82 m/s² to everything on Earth’s surface toward the center of the Earth. On the other hand, the rotational motion of the Earth generates the centrifugal acceleration of about 0.03 m/s² away from the Earth. The net acceleration is about 9.79 m/s² toward the center of the Earth. That is why everything on Earth’s surface stays on the surface, not flying away to space.
Flat-Earthers often make a false comparison using a wet & spinning ball. Water on the surface of a wet & spinning ball does not stick to the ball, but the Earth is also round, wet, and spins, yet everything stays on the surface. Then they make the erroneous conclusion that the Earth cannot be a spinning ball.
Continue reading “The False Analogy of a Spinning Tennis Ball”
We know for granted that during an equinox, the Sun rises from the east and sets in the west. Such facts are undisputed and have been verified through centuries of observation.
The flat-Earth model, however, is unable to accommodate this simple fact. And thus, it is not hard to conclude that the flat-Earth model does not represent reality.
Continue reading “The Direction of Sunrise and Sunset”
The thermosphere is a layer of the Earth’s atmosphere from about 95 km to 600 km. It is named ‘thermosphere’ because its temperature increases with altitude. The temperature in the thermosphere can reach 2500°C. However, air density in the thermosphere is very low to the point that heat conduction practically does not occur. Objects in the thermosphere will feel cold.
Flat-Earthers discovered that the temperature in the thermosphere could reach 2500°C. They are happy to ignore the other information which usually accompanies it: the air density up there is also far lower.
Continue reading “Space Flight and the Temperature in the Thermosphere”
Having the total height of about 830m, Burj Khalifa is the tallest building in the world. It is so tall that we can observe the sunset at the base of the building, then rush to the upper floors and watch the same sunset again for the second time on the same day.
This phenomenon can only happen if the Earth is a sphere. On a higher position, we will observe the sunset later than when we are closer to the ground.
Continue reading “Sunset at Burj Khalifa”
Every time NASA (or anyone else) releases a picture of the Earth from space; flat-earthers would compare it to another image of the Earth. Every photo is going to be different from another, but flat-earthers love to use this fact as a ‘proof’ that these photos are results of image manipulation, and that we are being deceived somehow.
Continue reading “Consistency of Photos of the Earth”
When a photo of spherical Earth is pointed out to flat-earthers, they will dismiss it as CGI in the blink of an eye; even if they haven’t done any analysis at all. They do this because their belief in flat-Earth is not evidence-based, and any evidence contrary to their beliefs needs to be invalidated no matter how.
They are so used to doing it, and sometimes they become confused by it themselves, to the point that they would take the slightest hint of digital manipulation of any picture of the Earth as evidence of the flat Earth.
Continue reading “The Philosophy of CGI”
Google Maps and similar apps use satellite navigation —like the GPS— to determine the location of the device. The apps also utilize cellular data or other data connection to obtain map and route data, which are not part of the GPS or satellite navigation system.
Some flat-Earthers noticed that Google Maps does not fully function when the cellular signal is not available. They concluded that GPS signals are transmitted by cell towers, not satellites. In reality, Google Maps is not GPS. The app uses GPS —and other satnav systems— to determine user location. The maps and route data in the apps are not part of the GPS.
Continue reading “Google Maps, GPS and Cellular Signal Reception”
Isaac Newton formulated the law of universal gravitation which explained the motion of all celestial bodies in space known at his time. Also, he demonstrated that it is the same law that is causing everyday objects to fall to Earth.
Newton wrote that he had not been able to discover the reason for the phenomenon of gravity. Flat-Earthers use this as “proof” that he lied and he did not know anything about gravity, and that gravity was a mere fabrication. They are wrong. Gravity adequately explained the motion of all celestial bodies and the fact that everyday objects are falling to Earth. Newton simply did not know what is causing it.
Continue reading “Isaac Newton and The Law of Universal Gravitation”
To most flat-earthers, the Earth is stationary. Stars are light sources attached to the firmament (for some mysterious reason), and they rotate around Polaris (again, for some mysterious reason).
However, they are missing the fact that Polaris is never visible from the southern hemisphere. And furthermore, the southern stars also rotate around the south celestial pole.
Continue reading “Polaris – The North Star”
We cannot take a straight line between two locations on a map and consider that line the shortest distance between the two locations. With a very short distance —like within a city— it wouldn’t usually matter. But for long-haul flights across continents, then it would matter a lot.
Flat-Earthers are known to use this mistake —whether deliberately or not— as a ‘proof’ that the Earth is flat. A common case they would bring is emergency landings.
Continue reading “Emergency Landings and Flight Route”
A good majority of pictures of Earth taken from space are being dismissed by flat-earthers merely because they are made using fish-eye lenses. They believe any curvature of Earth shown in those pictures is the result of the fisheye effect, and thus, cannot be used as evidence of Earth’s curvature. They even take a step further and assume a fish-eye lens is deliberately used to take every picture of the Earth taken from a high altitude so that they would have a curvature in it.
These claims are, of course, ungrounded. In some cases, we can conclude the curvature is there, even when a fish-eye lens is being used. We can use this useful property of any photographic lens:
A straight line will appear straight as long as it crosses the center point of the image.
Continue reading “Fisheye Lenses and Earth Curvature”
According most flat earthers, there’s no such thing as the continent of Antarctica. In their imagination, Antarctica is not a continent, but a long ice wall enclosing the Earth. Without having anything to prove that assumption, they look anywhere for any quote they can mine and stumbled into this quote by Admiral Byrd:
“Strangely enough, there is left in the world today, an area as big as the United States, that’s never been seen by a human being. And that’s beyond the pole, on the other side of the south pole from Little America.”
Continue reading “Admiral Byrd: “An Area As Big As The United States on the Other Side of the South Pole””
A human eye can only visually perceive the curvature of the Earth if we are at a considerable altitude from the surface, which is still beyond the reach of most humans today. A commercial jet airliner is the highest position realistically attainable by most humans today. At such altitude, we can only perceive very slight curvature, and only in an ideal condition.
The basis of flat-Earthers’ belief is that the horizon appears flat. They would say if we cannot see the curvature, then there’s no curvature, and thus, the Earth is flat. They are wrong. Most of us these days cannot travel high enough to see the curve. The best we can do these days is going on board a commercial jet airliner, which can only go about 11-15 km up, only a fraction of the radius of the Earth.
Continue reading “So, Where’s the Curvature?”
Welcome to FlatEarth.ws! We operate an Indonesian Flat Earth debunking site BumiDatar.id since July 2017. Due to popular requests, we’ll be doing English version of our posts here. Stay tuned!