You guys are getting it a bit wrong about the gyroscope. However, clarifying the way that a gyroscope works will reveal something that shoots a big hole in the FE theory that when you think you are traveling around the equator of the earth you are actually circling the North pole. A gyroscope does not work on gravity or magnetism. This means that celestial bodies, gravitation, magnetism, etc. have no effect whatsoever on the operation of a gyroscope. A gyroscope uses the momentum of a spinning wheel to resist changes in angular position. As you spin the heavy wheel in a gyroscope at a high speed, the wheel gains rotational momentum that is fairly large. Because the momentum of the wheel is now relatively high, it would take a fairly powerful force to change the position of the wheel. In order to turn this into a navigational instrument the gyro is mounted in a swiveling cage and attached to a pointer or more commonly, a transducer. When you start up a navigational gyro, you need to let it speed up, then you manually align the gyro to read your current magnetic heading. Once the gyro is set, it is the gyro's resistance to changes in position that cause the cage and the whole plane to rotate around the gyro essentially. You now have what is called a heading indicator. Notice it's not called a compass, this is because it does not operate on magnetic fields and it is different than a compass. This means that regardless of your position relative to any magnetic or gravitational center, the heading indicator will always be correct. Now, here we are, the argument that when planes fly in circles around the earth and return at the same location they are actually just circling the north pole on a flat earth. The FErs say that a compass will always point north and therefore lead you in a circle because of the changing relative position of the North pole. Therefore the planes are just flying in circles. In truth, any modern aircraft uses a directional gyro to navigate, this means that their gyro would not drift and they would continue to head in one direction and they would reach the edge if there were a flat earth. We all know this does not happen, because people have made those flights.