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abstraction > mathematical concept > number > quantity > velocity > space motion

space motion comparison table

Subject	is a kind of	has definition
velocity	quantity	The speed and the direction of an object's motion.
space motion	velocity	Velocity of a star with respect to the Sun; hypotenuse of the right triangle formed by its radial and tangential velocities (cf. peculiar velocity). Space motion vectors are U (in the direction of the galactic anticenter), V (in the direction of galactic rotation), and W (in the direction of the galactic north pole).

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