The ninth house is where we search for truth: experiences that broaden the mind and help us form our philosophy of life. Here we expand our consciousness, synthesize meaning from facts and experience, adjust personal attitudes to collective ideas, and understand how things are integrated into systems. This house rules higher education, religious and ethical understanding, spiritual visions, in-laws, long journeys, law and the higher courts. Here is what remains of the purification that took place in the Eighth house: its seed or essence. "Religion" comes from the Latin "re-," back + "ligare," to bind, hence, "to bind back," and thus refers to all things that last or endure, such as the truth. Many planets in the ninth are usually an indication of being unwilling to accept the conventional limits within which we were raised.

Astronomically speaking, the ninth house is that one-twelfth sector of the local sky clockwise from the Midheaven (see above picture) occupied by planets two hours after they culminate.

The arena of greatest intensity and personal growth in your life is higher education, or your spiritual and philosophical beliefs. This is where you either transform and evolve, or that which must die is annihilated. You may be able to breathe new life into already established doctrines or beliefs. You are passionate in your search for truth, and your travels will be a great source of growth and personal renewal. If Pluto is in hard aspect to the Sun, Mars, Saturn or Uranus, you may have great power struggles with in-laws; and if both Mars and Saturn are involved, be aware of violence in that regard as well.

If Pluto is within 10° of the midheaven it is conjunct the tenth house cusp and much of the above interpretation starts to become weaker. If Pluto is in the ninth house AND within 4° or 5° of the midheaven, then it is said to be on the "dark side" of the tenth house, and it influence will be felt in the tenth as well as in the ninth house. The closer a ninth house Pluto is to the tenth house cusp, the more it will be interpreted as though it were in the tenth house; when less than 3° from the midheaven, a ninth house Pluto expresses itself primarily—and eventually entirely—in the tenth house.