Exploring the mind, via science, is currently like exploring the bottom of the ocean from the comfort of a ship. One can infer many things from this detached POV, but it is not until you employ the diving bell that you see things you never knew were there. In this analogy, the first instinct of many scientists would be to design a device that allows one to explore the bottom more directly. In the case of psychology, this device is the most important tool of science; consciousness. Ultimately, it is consciousness that observes and synthesizes the data with consciousness the only diving bell you really need; au natural without machines since these are limp. Astrology is a system of observations, based on projection of the underlying phenomena of the mind. As a projection it appears to originate outside the mind, allowing the scientists in us, that third person POV. Luckily in psychology, most people who pursue that field have had direct experiences with the unconscious mind, which could be as simple as neurosis. There is an overlap between self observation and the conventions of third person theory, which meet the requirements of direct investigation, st least half way. My favorite psychologist was Carl Jung. He went through thousands of dreams generated by hundreds of reliable witnesses. Based on this data he saw trends in the data common to all. He called this the collective unconscious. He also saw similar symbolism appearing in astrology and even religions which indicated their origins in the spontaneous expression of the brain beyond our control. These are often projected outside where even science expects to see it. But they nevertheless help to map the underlying phenomena. Tp test this theory one need to get into the diving bell of consciousness and make direct observations since ship can't see the detail needed to verify.