Axis
Any of three straight lines, the first running through the center of the fuselage lengthwise, the second at right angles to this and parallel to the horizontal airfoils, and the third perpendicular to the first two at their point of intersection (aircraft).
Azimuth
An arc of the horizon measured between a fixed point (e.g. true north) and the vertical circle through the center of an object.
Ballistic trajectory
The curved portion of a vehicle trajectory traced after the propulsion force is cut off.
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