The astral system of the human being with six (twelve by polarity) inner constellations revolving around the sun of the omniscient spiritual eye is interrelated with the physical sun and the 12 zodiacal signs. All men are thus affected by the inner and outer universe. The ancient Rishis discovered that man's earthly and heavenly environment in a series of twelve-year cycles push him forward on his natural path.
Though many men, after physical death, remain in an astral world for 500 or 1000 years, there is no invariance rule about the length of time between incarnations. A man's allotted span in a physical or an astral embodiment is karmically predetermined.
In the Christian religion the astral plane or place between heaven and earth is what is called "purgatory." The astral plane is not heaven.
Let not your heart be troubled; you believe in God. Believe also in "me". In my father's house are many mansions (astral planes of existence). If it were not so, I would have told you. I go to prepare a place for you.
-Jesus, John 14:1,2