It comes down to the "correlation/causation" relationship. Meaning, is it the celestial object itself, sending a signal that somehow attaches to a line of longitude and causes an Astrological effect? Or, is it our perception of the correlations themselves, which enable us to discern causation? If it's the latter, then a "measured point" could be an important enough indicator to provide major, discernable correlations.
I'm using the Ascendant as a Sign-ruler, because it's one of the premier zodiacal placements, and because I'm not attributing astrological effects to the physicality of the objects themselves. The NN is important, but less so than the Ascendant.[IMO]