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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“Whoever can discern truth has received his commission from a higher source than the chiefest justice in the world who can discern only law. He finds himself constituted judge of the judge. Strange that it should be necessary to state such simple truths!”
—Henry David Thoreau (1817–1862)