The 8th house is usually said to be related to psychology. Aquarius also is a sign of humanistic psychology.
I wonder how could one describe the difference between the two houses and which aspects of psychology do they describe?
All the houses have a psychological connotation, however, the 8th house is the hosue of what is under the surface, what is unseen within the individual as well as their weaknesses, so this makes it the house of any deep type of psychology. Psychology on a more superficial level is the 4th house, but the kind that changes a person is 8th house.
The 11th house is the house of love received as a formative experience. Ideally this experience is one that allows a person to have developed the self esteem and desire to pursue goals that are important to them, to have something to progress towards.
Aquarius according to Jaimini is a maker of wells and tanks involved in dharma. So the dharma part means that they are following their nature, which a person develops with the formative experience of healthy love. The wells and tanks means that they have developed a reservoir of happiness and emotional comfort and health that they fall back into when the world does not provide that, so they have the capacity to be emotionally self sufficient. Upon being capable of living as themselves, dharma, and having the ability to porivide for themselves emotionally, a person is psychological complete. So aquarius is the sign of psychological completion. Saturn rules this as its a state that has no emotional dependencies, wounds or other things that the external world can irritate. Following this state there is only one thing left to do in this world and that is to become liberated, which is pisces.
I have Sa in Aquarius. What you wrote is what I have been trying to learn and grow into...