I haven't read the article, but IF you're willing to accept that where various celestial bodies were when you were born have some effect on your life, perhaps due to gravitational, optical, or other perhaps as-yet unknown reasons, then it makes sense that the bigger, nearer objects would have the greatest influence, and smaller more distant would have less of one – but once you know it's there you can take it into account.
Not unlike working out the movement of the planets around the Sun. Taking each planet independently you can calculate a good approximation of its orbit, but it's only when you include the gravitational effects of other planets that you get nearer the reality. Every extra celestial body you take into account gives greater accuracy.
Isn't this how they know there are planets around other suns – by looking at the gravitational effects and working backwards...
(OK, I've just read the article, and it's clearly a lot of bull, but it doesn't negate my argument for why astrology needs to take the objects into account.)
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