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In a conventional view, we regard the faster planet as the first in natal charts. On the other hand, e.g. when you’re interpreting the aspect, applying the same rule could limit the interpretation itself.
In the above example, Mars square Uranus will generally mean a decision to act given a sudden, unpredictable, and possibly damaging event. In contrast, Uranus square Mars will point out your attention toward an instinctive reaction that could harm your evolutionary potential and future perspectives. This sort of binary interpretation allows you to correctly judge all the facts of a situation, maintaining an open-minded attitude.