Earth Axis

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Earth Axis

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Any one of a set of mutually perpendicular reference axes established with the upright axis (the Z-axis) pointing to the center of the earth, used in describing the position or performance of an aircraft or other body in flight. </dd>
The earth axes may remain fixed or may move with the aircraft or other object. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use