In astrodynamics or celestial dynamics orbital state vectors (sometimes state vectors) are cartesian vectors of position and velocity that together with their time (epoch) uniquely determine the trajectory of a body in space.
Read more about Orbital State Vectors: Frame of Reference, Position Vector
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“Our object in the construction of the state is the greatest happiness of the whole, and not that of any one class.”
—Plato (c. 427–347 B.C.)