Today, 7th house lord sitting in 6th house.

So first of all, let's see what 6th house and 7th house represent -

6th house is 1st of Dushthana Houses (houses # 6, 8 and 12) and 2nd of Upachaya Houses (houses # 3, 6, 10 & 11). 6th house represents things like diseases, debts, obstacles, enemies, disputes, competitions, litigations, under privileged people, pets, daily routine life, colleagues at work place etc. One thing to remember here is that it is one of Upachaya Houses, i.e. House # 3, 6, 10 & 11. Upachaya Houses improve with time. It means any planet in these houses improves in results with age and real good result is seen from a person's 30s. Also, all the malefic planets provide very good results in Upachaya Houses but results may be seen in 30s. 

7th house is house of market place, other people (masses), business partnerships, agreements, marriage, spouse, marital happiness etc.

Now, what does it mean to have 7th house lord sitting in 6th house?

It means the planet which rules/controls/owns the 7th house of your horoscope is sitting in the 6th house of horoscope.

Now, what is the impact of having 7th house lord sitting in 6th house?

Its generic interpretation is that you look for and get a spouse who is in Service Industry, means they have a regular job/office life. Your spouse's daily routine may be to deal with Conflicts or Diseases. So, this planetary position is seen most commonly in charts of people, whose spouse is either in Legal field or Medical field. At times, it is a placement for Doctor/Lawyer couple. In certain situations, it also shows that marriage life is going into disputes or disagreements. So, it is one of the situation that may cause a Divorce but for that to happen, you need a malefic planet in 6th house as 7th lord, in bad dignity and person having dasha and transit of same planet in such houses which cause divorce. So, it is not generic rule. But yes, it can be said that native faces obstacles in married life during certain dashas and transits.

Now, results may be different due to aspect, conjunctions of other planets or the planet being Retrograde or Combust. Moreover, now we also need to check the strength of 6th house lord as 7th house lord is going in 6th house. So again, Overall Chart Reading is important.

So, let's see how different planets will behave differently as 7th house Lord in 6th house.

Sun - Suppose it is a Aquarius Ascendant chart and Sun rules the 7th house with Leo sign and sits in the 6th house in the sign of Cancer. It shows that your spouse is an authoritative figure in Service Industry or Health Care field. Spouse can be in Govt Hospital or in any other Govt Dept where you need to take care of people like Children related. Though being Authoritative, they are quite emotional at the same time about nourishing and taking care of people. They may be in Veterinary Field too. It also shows that Father of Native in Health Care field.

Moon - So it is Capricorn Ascendant Chart and Moon rules the 7th house with Cancer sign and sits in 6th house in Gemini. This again shows a spouse who is in health care field, but this time emotional side is more expressive. As Gemini is sign of Communications and Counselling and 6th house relates to Diseases, it certainly shows that spouse is a Health Counselor. It shows person's mind is always into dealing with conflicts and counselling people about those conflicts. It shows person's mother may have to deal with lots of obstacles in her life or she may be in the same field of Counselling.

Mars - Mars can be 7th house ruler through its two signs. So, let's take both one after the other.

Libra Ascendant - So if it is Libra Ascendant, Mars rules 7th & 2nd house and sits in 6th house in Pisces sign. This shows a spouse who is more into sports and competition. As Mars is a natural Athlete and 6th house is related with Competitions and defeating enemies, it certainly shows someone who is a Sportsman. Even for a guy, his wife would be Tomboyish and into Sports and all. But as Mars is in spiritual sign of Pisces, they may be interested in Yoga or Martial Arts type of stuff in Sports. Mars is in friendly sign here, so though they may be separated from Spouse but separated will be for a good reason rather than conflicts. Good reason means, an Athlete is going to a different country to compete, so he/she had to leave his family in his country, much like Sachin Tendulkar, best example of Mars in 6th house.

Taurus Ascendant - Now if it is Taurus Ascendant, Mars rules 7th & 12th house and sits in 6th house in Libra sign. This is still Mars in neutral sign, but as Scorpio is a sign of transformation and Mars remains a natural malefic planet and it is sitting in the sign of relationships, so some disagreements may occur in relation. It more so shows someone dealing in matters of relationship conflicts, like a Divorce Lawyer. It also shows a relationship counselor but counselling ways will be very straight forward here as Mars remains planet of dominance. Spouse will remain the dominant partner in marriage. Disputes and Disagreements in marriage will depend on Dasha/Transit but couple would still need to be careful about dominating each other, as that may lead to disputes.

Mercury - Mercury also can be 7th house ruler through its two signs. So, let's take both one after the other.

Sagittarius Ascendant - If it is Sagittarius Ascendant, Mercury rules 7th & 10th houses and sits in 6th house in Taurus. It shows a very communicative relation with spouse. Here, spouse is either working as a counsellor in health care field or may be in some work related to Wealth and Finance, like in any business related with wealth. Here, relationship is totally dependent on communications. How well they can convey to each other is a test of prosperity of this relation. With benefic planets in 6th house in good dignity, chances of disputes are minimal.

Pisces Ascendant - If it is Pisces Ascendant, then Mercury rules 4th and 7th house and sits in 6th house in Leo. Here, Mercury is again in a friendly sign. So, we can expect good results here too. Almost similar results. Here, spouse's work as a counselor may bring a position of Authority to him/her. Here, spouse may be very detailed oriented and analytical, and that may turn into arguments but as Mercury is in friendly sign, I don't see much damage being done here. Communication is still the foundation of relation but couple needs to watch about from being too analytical in relations.

Venus - Venus also can be 7th house ruler through its two signs. So, let's take both one after the other.

Scorpio Ascendant - If it is Scorpio Ascendant, Venus rules 7th & 12th house and sits in 6th house in Aries sign. This shows a spouse who is very aggressive, person who takes initiative and action oriented. This spouse will assert his/her individuality. It will be tough to keep this spouse under any unnecessary control and it is not advisable also. Career wise, they will be in Health Care, Service field. They can be in service of Animals too, if Venus is in Ashwini Nakshatra.

Aries Ascendant - If it is an Aries Ascendant, Venus rules 2nd & 7th house and sits in 6th house in Virgo, where it is debilitated. Now here, if Venus is nearby the exact degrees of debilitation then it may show some real concern towards relationship, as Venus not only rules the 7th house but it is also significator of relations. But again, those concerns will always surface during Venus or Mercury Dashas and relevant transits. Again, any other yoga or dasha can change the scenario totally.On other fronts, it again shows a spouse who is in health care and may be working with Animals. They remain service oriented.

Jupiter - Jupiter also can be 7th house ruler through its two signs. So, let's take both one after the other.

Gemini Ascendant - If it is Gemini Ascendant, Jupiter rules 7th & 10th house and sits in 6th house in Scorpio Sign. As Scorpio remains a sign of ups and downs, changes and chaotic events in life, this remains a position where person's relationship may go through transformative events but as Jupiter remains a benefic planet and it is in friendly sign, it will be able to prevent disputes. Here, it shows that spouse may be working at a place which has absurd timings or chaotic work environment. It also shows a spouse who is working as a counselor in Occult related field. It also shows someone who is Teacher/Guide in Medicines and Surgeries.

Virgo Ascendant - If it is Virgo Ascendant, Jupiter rules 4th & 7th house and sits in 6th house in Aquarius. Here, Jupiter is in neutral sign, much better placement. It shows a spouse who is in Service or Job in Large Organisation/MNCs. Spouse's work relates to Finance, Mentoring or Guide in MNCs. It is a good placement for success in job field and person will gain a lot by serving others.

Saturn - Saturn also can be 7th house ruler through its two signs.

In either sign (Capricorn/Aquarius) as 7th house lord, Saturn in 6th house (for Cancer/Leo Ascendants respectively) surely shows someone whose spouse is in Law field, a Lawyer or a Judge. Here, it can show some troubles in marriage as Saturn remains the most malefic along with Rahu. But again, it all depends on dashas and transits. No generic rule. Best thing to avoid any trouble in relations whenever Saturn gets connected with 7th house or 7th house lord is to delay marriage till 30 at least. As always, Saturn in 6th house is best placement of Saturn as Saturn suppresses all dushthana houses # 6, 8 and 12 through sitting or aspects.

Rahu - If Rahu is 7th house Lord through its sign Aquarius, as it co-rules Aquarius along with Saturn, and sits in 6th house in Capricorn then 1st of all we need to make sure of Saturn's position as it is the main ruler. Rahu in Capricorn in 6th house will transform Rahu as Saturn as Rahu changes its nature as per the lord of sign it is placed in. At the same time, Rahu's basic nature of being insatiable will remain there. Rahu in Capricorn in 6th house basically indicates that a tug of war continues within the minds native or spouse mind. Whenever Rahu and Saturn exchange energies, person wants something desperately due to Rahu but Saturn restricts it as it wants to give with delay. In such matters, person may end up having break ups in early part of life if Dasha and Transits are such. They love having authority at work place. Their work environment is highly unusual or foreign one. Spouse is obsessed about rules and regulations, and that may lead to disputes.

Ketu - Likewise, If Ketu is 7th house Lord through its sign Scorpio, as it co-rules Scorpio along with Mars, and sits in 6th house in Libra then 1st of all we need to make sure of Mars' position as it is the main ruler. As Ketu isolates/separates a person from the things related to the house Ketu is sitting, here it separates person from the concept of as to where he is serving. It means these people are blind as to where they are working, if they are getting enough return/salary/bonus for their work. They just want to mechanically work without any thought of getting into office politics and other things. Hence, it so happens that they may not get their deserving dues in jobs. It also separates them from concepts of Competition. They are the last people who want to get into any dispute. They live a healthy life, as they are also separated from Diseases. Ketu ruling 7th house of relations and sitting in sign of Libra of relationships, surely suggests some testing times in relations, during certain dasha and transits. Here, Ketu's 2nd nature of being Spiritual is going to help. The more spiritual couple is, the more prosperous will be married life.