<P> An aircraft in flight is free to rotate in three dimensions: yaw, nose left or right about an axis running up and down; pitch, nose up or down about an axis running from wing to wing; and roll, rotation about an axis running from nose to tail . The axes are alternatively designated as vertical, transverse, and longitudinal respectively . These axes move with the vehicle and rotate relative to the Earth along with the craft . These definitions were analogously applied to spacecraft when the first manned spacecraft were designed in the late 1950s . </P> <P> These rotations are produced by torques (or moments) about the principal axes . On an aircraft, these are intentionally produced by means of moving control surfaces, which vary the distribution of the net aerodynamic force about the vehicle's center of mass . Elevators (moving flaps on the horizontal tail) produce pitch, a rudder on the vertical tail produces yaw, and ailerons (flaps on the wings that move in opposing directions) produce roll . On a spacecraft, the moments are usually produced by a reaction control system consisting of small rocket thrusters used to apply asymmetrical thrust on the vehicle . </P>

What is the difference between roll pitch and yaw
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