Imagine an older tv with rabbit-ears antennae. When a person walks in the room to a specific spot near the door the tv flickers a little. when the person walks over to the chair it goes a little fuzzy. When he walks to the lamp the vertical hold goes wild. Then change the directions of the tv's antennae and walk to the same places- there'll be different responses in each place.
It seems like that's how aspects work. When a planet is at a certain angle from another planet, each planet's electric field react together. When you move away from that angle a bit, that reaction goes away until you reach another angular distance from another planet which creates its own response based upon its magnetic or radiation fields.
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