Combining a star's proper motion and its distance allows us to determine its transverse velocity.

Name: Combining a star's proper motion and its distance allows us to determine its transverse velocity.
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The transverse velocity of a star is calculated by combining its proper motion (angular movement across the sky) with its distance from us. This allows us to determine how fast the star is moving sideways relative to our line of sight.

Combining a Star's Proper Motion and Its Distance Allows Us