![]() ![]() If Earth were to change acceleration, we'd certainly feel that, and it wouldn't be pleasant, like a sudden slam on the brakes at a planetary scale (while the atmosphere would keep moving at the same 465 metres per second and wipe the surface of the planet). ![]() One way to feel motion is to feel wind on your face - but remember that Earth's atmosphere is travelling with us at the same speed. It's the same with Earth's rotation - our planet completes a full turn around its axis every 23 hours and 56 minutes, spinning incessantly at an almost entirely constant rate. In order to perceive the movement of the plane, you have to glance at the clouds outside. The reason is simple: you, the plane, and everything else inside it is travelling at the same speed. You've unbuckled your seatbelt to go on a walk down the aisle, but you can't feel the movement of the plane. Think of being on an aeroplane when it's smoothly travelling at a constant speed and constant altitude. So why can't we all feel it? The answer lies in the nature of Earth's movement. ![]()
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