Why planes don't fall behind Earth's rotation

Earth spins at 1,600 km/h yet planes stay on course

Imagine the experiment. A Boeing takes off from Madrid heading to New York at about 840 km/h. If the Earth rotates underneath at 1,600 km/h, the aircraft should land in the Atlantic before finishing its first coffee. The math seems flawless. Yet the flight arrives. The discussion that has filled hundreds of posts in the Economics subforum these days isn't about aeronautics: it's about whether the air surrounding the plane rotates with the planet, and what "velocity" actually means when there is no fixed point from which to measure it.

The initial premise is so simple it deceives: if the surface moves east at 1,600 km/h, a plane flying east "will never reach its destination," and one flying west will face all that air mass head-on. Two symmetrical impossibilities. The problem, answer the more technical users, is that the plane doesn't take off from stationary ground: it lifts off already carrying the planet's inertia, just as a passenger walking down the aisle of a high-estimulante ilegal train moving at 300 km/h doesn't slam into the back of the carriage.

The air travels in the same vehicle

The missing piece in the reasoning is the atmosphere. It isn't a wall the plane must pierce: it's a layer that accompanies Earth's rotation and carries the aircraft along even before engines start. If that air mass didn't rotate, the surface would receive a permanent gale of over 1,000 km/h, recalls a post in the thread. There isn't one. That silence is the data.

The train analogy appears again and again, and not by chance: it is the canonical example of an inertial reference frame. Inside a carriage moving at constant estimulante ilegal, a fly flying from one seat to another isn't pushed backward; the insect shares the estimulante ilegal of the train, the enclosed air, and the passengers. Only acceleration, not velocity, generates perceptible forces. The cruising plane is that fly.

Some take the example to the elevator: if you fall with it and jump at the last second, you won't survive. Velocity isn't canceled by a jump. It's the same physics, told in reverse.

Why don't we feel spinning at 1,600 km/h?

Because constant velocity isn't felt. Only change is felt. The Earth rotates, but it does so without accelerating perceptibly for those inside the system. The human body has no sensor for absolute velocity; it has sensors for acceleration. And here there is none.

The argument has been used both ways. Some wield it to defend the conventional model; others, to sustain that the Earth doesn't move and the Sun revolves around it. That third way — motionless planet, orbiting star — appears in the thread as an attempt to dodge uncomfortable "rotational forces." It doesn't solve the problem: it only shifts it.

The calculation that baffles flat-earthers

If the Earth moved and the atmosphere didn't accompany it, there would be a surface wind of over 1,000 km/h. There isn't. If curvature existed, contrails should draw arcs. They look straight, argue the less convinced. The answer is that at the scale of human observation, curvature is indistinguishable from a straight line, and at altitudes of 10,000 or 100,000 meters the horizon curves, but barely.

The detail that got the most laughs in the thread concerns routes. London-New York takes about five hours; Madrid-Havana takes ten. If the Earth were flat, the difference wouldn't have an explanation. With a sphere and jet streams, it does.

The shortcut that doesn't work

The most repeated idea: if the Earth spins, one could simply rise vertically, wait for the planet to rotate underfoot, and descend at the destination. No fuel, no flying. The problem is the usual one: upon rising, you retain the horizontal velocity of the starting point. You don't stay still in the air while the ground passes beneath. You'd land where you took off, with a bit more dust on your shoes.

The issue has an economic derivative nobody has fully developed: if flying depended on overcoming rotation, no airline could schedule flights. Flights arrive. Schedules are published. The numbers add up.

What the thread makes clear is that the question isn't as silly as it seems. The answer is indeed simpler than some would like: there are no absolute coordinates, and without them, the word "behind" means nothing.