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abstraction > mathematical concept > number > quantity > velocity > tangential velocity

tangential velocity (transverse velocity)
subject			fact

tangential velocity	has synonym transverse velocity
	has definition A star's velocity across an observer's line of sight. To calculate a star's tangential velocity, one must know the star's distance and proper motion.
	is a kind of velocity
velocity	has base unit length per unit time
quantity	has unit
number	has value