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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“Whoso taketh in hand to frame any state or government ought to presuppose that all men are evil, and at occasions will show themselves so to be.”
—Sir Walter Raleigh (1552–1618)