As far I understood, all things emit an astral radiation. By their more or less eternal cycle and mass, planets and stars are powerful psyshic emiters, and the angle they form together create a chord, like in music, synthetizing charasteristics of a personality.
The other point is what is the Soul ? I'd defined the Soul like an astral structure, like a crystal, reflecting astral light on several wavelengths between its facets. Soul is like a psychic computer with regulation mechanisms but is sifficiently complexe and elementally well balanced to develop a consciousness.
The shape of your Soul is imprinted at birth and your Soul continues to reflect internally the cosmic astral light giving you the sensation of how you feel - depending of its proportions - influencing your intellectual/mental point of you, then the personality you develop.
There is a balance between the mental and the psychic. The more you are humble, the better you can control yourself. If you are selfish and stubborn, you fight against your own energy and have difficulties to evolve or understand who you really are, must do...
Planets and stars are like people around you, they are psychic forces that influence you.