When the ruler of the ninth house is in the sixth house, this means that your work or daily activities may be related to international matters, publishing, the legal system, or spirituality.
Here are some examples.
Your work can involve regular travel (especially overseas) or dealing with international matters, such as communicating with other cultures. You may frequently write, study or teach. You may publish books.
You may have some kind of daily spiritual routine. Your work can have something to do with legal matters.
This placement can also mean that frequent traveling overseas can make you sick, especially if this astrological combination is afflicted. Some other matters may also lead to worse health, such as changing your lifestyle frequently, the lack of general stability in life, and being so optimistic that obvious dangers are overlooked.
Furthermore, you can exhaust yourself by being interested in too many things, as well as habitually putting yourself into unknown situations to challenge yourself or to make yourself grow. So this is shown as not advisable to do, as your health may suffer, especially if this combination is afflicted.
Also, when the ruler of the ninth house is in the sixth house, and especially if this combination is afflicted, it’s really not advisable to get involved in any legal matter as it can end up dragging on for ages and consequently hurting your health. So it’s best to resolve any problem or disagreement out of court and out of the legal system.
This placement could also mean that the people working under you are likely to be foreign, such as those that you manage at work, or your domestic staff, for example. Another meaning is that the origin of pets that you keep may be the overseas.
It could also mean that the chronic illnesses that you suffer from originated from abroad, such as you catching those diseases there, or the origin of the disease itself could be some distant country.
Finally, if you are a spiritual person, and this combination is not afflicted, it means that in this life you can make great spiritual progress. That’s because it’s easy for you to make a spiritual practice into your daily endeavor, which produces lasting results and progressively wider awareness.