Glossary of Space Exploration Terminology

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Z
Z-axis
See yaw.
Zenith
The point on the celestial sphere directly above the observer. Opposite the nadir.
Zero gravity
A condition in which gravity appears to be absent. Zero gravity occurs when gravitational forces are balanced by the acceleration of a body in orbit or free fall.
Zero lift trajectory
A trajectory in which the control system acts to maintain a condition of no aerodynamic lift on the rocket.

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Rocketry & Space Technology

Glossary courtesy of Robert Braeunig's
Rocketry & Space Technology website.