Aspect means: view, appearance; here literally, the way in which the planets look at each other, i.e.
the phases of the planets.
We have to regard the aspects of the planets as the x-rays of the Cosmos which shine through us and bring the weak places of our characters temporarily to light.
It is, as it were, a warning that something in one direction or another should be improved.
How is it that a certain relation between aspects, e.g.
an opposition of the Sun to Saturn, causes a heavy feeling of depression with one, whereas with another it passes unnoticed?
Because the former was born at a moment when e.g.
the same opposition or an aspect of equal effect took place in the Universe, which caused his bodies to be responsive to the depressing and limiting Saturn-influence.
His physical, astral and mental bodies are, as it were, tuned to the key which was then in