Moon in 9th House synastry relationships are marked by family traditions, an emphasis on upbringing, and altruistic bonds of both personalities. Regardless of whether these people get married or just be business partners and friends, the factors of education, ideology, and worldview will be crucial in their communication.
In a positive scenario, both individuals may turn out to be excellent partners in business, joint self-education, and travel. The “lunar” personality will advertise its approach to the everyday household and business life, gradually introducing the personality of the Ninth House to it, while the latter will contribute to expanding the worldview and increasing the social activity of the “lunar” personality.
from F. Sakoyan, L. Ecker
Moon in 9th House Synastry Explained
Moon in 9th House synastry is an erratic aspect. If the male Moon is in the Ninth House of his wife, she will color her concern for her husband’s well-being with some hidden meaning. At the same time, she’ll likely find his food and clothing habits strange and exotic.
If the baby’s Moon falls into the Ninth House of his or her father or mother, the parent will often be taken by surprise by what the child does and says, often turning to specialized literature on the corresponding subjects and, usually, learning a lot more in the process.
In general, Moon in 9th House synastry is the aspect of a muse inspiring you to create a major work in a niche area; but it is important to understand that, while the muse will provide the initial push and many a wonderful moment in the process, finishing this work will still be up to you. Likewise, a wife with the Moon in the Ninth House of her husband can inspire him to go on a long and meaningful journey, but the preparations and the hardships of the journey itself will have to be carried out by him.
All in all, Moon in Ninth House synastry is an inspiring aspect, although certainly not the easiest, especially if you are disinclined to take responsibility for your own actions.
from A. Podvodny