Yes. If you think of the notes as the star's brightness. If this is the dimmest the star gets - and this is the brightest. Then the time it takes to get from here - to here - could tell us how bright it actually is, which we could compare to how it appears, which could tell us how far away it is, which we could compare to other stars, which could tell us how far away they are, and if we know that we can - We can skip star to star across the deepest space until we know...