Today, 10th house lord sitting in 12th house.
So first of all, let's see what 10th house & 12th house represent -
10th house represents things like Government, Father, Authority, Fame, Work Environment etc. Here, Authority should not be understood in literal sense, like someone got a Government job or became a Manager or CEO of a Firm. Here Authority means doing any work with complete perfection and your opinion matters when comes to making any decision related to that work, so even a good Hacker can be a person of authority as he is master of that particular work. 10th house is one of the houses normally checked for Career/Work/Duty in Life.
12th house is house of Losses, Expenses, Isolated Places, Spirituality, Foreign Lands, Foreign Companies, Imagination, Sub-Concious Mind, Charity, Donation, Asylums, Jails, Hospitals, Hidden Talent and Secrets of Other World etc.
One thing to always keep in mind with 12th house is that it basically remains the house of losses. So, whichever planet goes in 12th house, even exalted, is in the bucket of losses. Now, to gain out of any such planet, you need to put double effort in things related with that planet.
Now, what does it mean to have 10th house lord sitting in 12th house?
It means the planet which rules/controls/owns the 10th house of your horoscope is sitting in the 12th house of horoscope.
Now, what is the impact of having 10th house lord sitting in 12th house?
In present day and age, its most common interpretation that we can give is person's career will either take him to Foreign Lands, Foreign Companies or MNCs, but this position holds much more importance than this. This shows person's career should be related to Creativity and Imagination. They work well when they are secluded from the world, i.e. in Privacy. So, this is another placement where person may follow creative pursuits as his Career. It also shows Career in Hospitals and Jails. This shows person has to travel abroad regularly due to his Career. At the same time, 12th house is house of losses. So, if a malefic planet is going here with wrong dignity and person goes through its MD and relevant Transits both, then it may result in loss of Career or Fame for some time. Overall, this shows a Creative Career or Career in Foreign Lands.
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 12th house lord as 10th house lord is going in 12th house. So again, Overall Chart Reading is important.
So, let's see how different planets will behave differently as 10th house Lord in 12th house.
Sun - Suppose it is a Scorpio Ascendant chart and Sun rules the 10th house with Leo sign and sits in 12th house in Libra, where it is debilitated. If Sun is nearby its exact degrees of debilitation then it shows that person will have some serious issues with Authority, Govt and Father. They might even be away from Father for various reasons. This person may not do well under anyone's authority. At the same time, as Sun is in Venus ruled sign & in the 12th house and 12th house & Venus both represent Creativity, they will do well in any Creative Pursuit. Field of Creativity will be decided by the Nakshatra & Nakshatra lord of Sun and position of Venus. If they go into jobs, it will be struggle and ego will be hurt all the way. If Sun is far away from debilitation degree and has support of other planets then person may be a Diplomat or someone working for home Govt in Foreign Countries.
Moon - So it is Libra Ascendant Chart and Moon rules the 10th house with Cancer sign and sits in 12th house in Virgo. Cancer is Nourishing People, Moon is Emotions & Mother Care, Virgo is Healing and 12th house is Hospitals. So, one prominent indication we get from this placement is someone in Medical Field. They like to emotionally take care of people. Even if they don't take any medical education, they will always have this healing touch effect. Mother may be away from person for various reasons. Alternatively, this can create a good Author as Moon is in Mercury's sign and 12th house of Imagination.
Mars - Mars can be 10th house ruler through its two signs. So, let's take both one after the other.
Cancer Ascendant - So if it is Cancer Ascendant, Mars rules 10th & 5th house and sits in 12th house in Gemini sign. As Gemini is sign of Business and Mars represents our courage and risk taking ability, this shows a person who does Business with Foreign Lands or Foreign People. They are very aggressive and initiative with their Business Ideas and Marketing. Similarly, they are very direct about their communications, and at times harsh too. As Mars remains a malefic planet, sitting in enemy sign and in 12th house of losses, it shows a person who is unable to save money.
Aquarius Ascendant - Now if it is Aquarius Ascendant, Mars rules 3rd & 10th house and sits in 12th house in Capricorn sign, where it is exalted. This is a much better position of Mars. This shows either a Sportsman, Soldier or any other Govt Servant often travelling to Foreign Lands for his job. As 12th house also represents Hospitals and Mars represents Doctors, it can be any Doctor or Surgeon working in isolated places like Hospitals, Overall, a very strong willed person.
Mercury - Mercury also can be 10th house ruler through its two signs. So, let's take both one after the other.
Virgo Ascendant - If it is Virgo Ascendant, Mercury rules 10th & 1st houses and sits in 12th house in Leo. Mercury is Communication & Skills, Leo is sign of Creativity and 12th house is imagination. So, what this combination creates is a very good author. A person who uses his creativity in the field of writing through his imaginations. So, they can be writing either fictional stories or love stories (btw, both are one and same :P ). This is another position where person can be involved in Foreign Trade and import/export Business.
Sagittarius Ascendant - If it is Sagittarius Ascendant, then Mercury rules 7th and 10th house and sits in 12th house in Scorpio. This is a super occultist. Mercury is Astrology, Counselling & Collection of Information, Scorpio is Occult and Mysticism, 12th house is Spirituality. They can keep amazing amount of information of Occult & Other World with them. They are best as Occult and Mystical Counselor.
Venus - Venus also can be 10th house ruler through its two signs. So, let's take both one after the other.
Leo Ascendant - If it is Leo Ascendant, Venus rules 10th & 3rd house and sits in 12th house in Cancer sign. this is another position which can take you in healing field as Venus represents Service and Devotion, Cancer is sign of Nourishing People and 12th house is house of Hospitals. So, it clearly shows someone who is in serving people. Nowadays, it also has importance in Careers in Software industry as Venus is creativity and 12th house is working behind scenes. It also means working like Movie director, writer or editor.
Capricorn Ascendant - If it is Capricorn Ascendant, Venus rules 5th & 10th house and sits in 12th house in Sagittarius. This shows a person with immense love for Higher Education, Religion, Philosophy and Spirituality. They will go to Foreign Lands for Higher Education, which will improve their career. Or it can be the other way around that due to their Career, they will travel to Foreign Lands to teach people about Religion, Spirituality & Higher Education. In love matters too, they will be impressed with a learned person rather than a good looking person. Here, Creativity prospers in Spiritual realm. For a guy, both positions of Venus may bring Wife from Foreign Lands.
Jupiter - Jupiter also can be 10th house ruler through its two signs. So, let's take both one after the other.
Pisces Ascendant - If it is Pisces Ascendant, Jupiter rules 10th & 1st house and sits in 12th house in Aquarius. This shows someone working in Foreign Lands in MNCs, Large Organizations, Corporate in the field of Finance. They can be working as Mentor or Guide at MNCs or their VPs or CEOs. Alternatively, they can be part of an international religious/spiritual group like Theosophical Society or ISKCON and giving their services through such groups. They will approach religion through Scientific Methods. It means they need Scientific Reasoning behind all the Religious Stuff.
Gemini Ascendant - If it is Gemini Ascendant, Jupiter rules 7th & 10th house and sits in 12th house in Taurus. This shows person's wealth is expanding through Foreign Lands or Foreign Contacts. These people will also be in Finance related work in Foreign Companies. They can be Finance Manager/Planner too. They may be super wealthy. They will be inclined towards gaining knowledge in Religion, Spirituality or Wealth/Finance. For a girl, both position of Jupiter may bring Husband from Foreign Lands.
Saturn - Saturn also can be 10th house ruler through its two signs.
In either sign (Capricorn/Aquarius) as 10th house lord, Saturn in 12th house (for Aries/Taurus Ascendants respectively) surely indicates that access to foreign lands or foreign travels came late in life. In early life, they may have tried a lot to reach to foreign lands but their may be one or the other obstacles. Going to foreign land or returning from foreign land will be equally tough. For Taurus ascendant, Saturn is debilitated in 12th house. It shows some serious legal issues which forced person to be in jail for a long time, so they should be careful about Legal Matters. They might get into some legal issue in Foreign Lands too. It also shows that person is frugal or miser and doesn't spend a lot. In early life, they will never get good Spiritual Gurus but through age when they reach 30s, they get some old and wise Guru. Spirituality develops late in life. Profession wise, they may be in the field of Law or they may be working in Corporate.
Rahu - If Rahu is 10th house Lord through its sign Aquarius, as it co-rules Aquarius along with Saturn, and sits in 12th house in Aries then 1st of all we need to make sure of Saturn's position as it is the main ruler. Rahu in Aries in 12th house will transform Rahu as Mars 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 Aries in 12th house basically shows a person who is meant to be in Foreign Land. As Aries represents Individuality and Ego, these people find it in Foreign Lands. Rahu and 12th house both represent Foreign Things, so going to foreign land becomes easy here. This person may become kind of spendthrift. This shows good gains from MNCs. At the same time, Rahu in Aries shows a person who is highly impulsive and prone to sudden anger. So, they may like to be careful about it.
Ketu - Likewise, If Ketu is 10th house Lord through its sign Scorpio, as it co-rules Scorpio along with Mars, and sits in 12th house in Capricorn 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 being in Authority or working under anyone's authority. They are better following their own path in life rather than working under others. It also separates person from the spiritual beliefs spread by others. They never find themselves agree with the concepts of spirituality of others and always find fault there. Similarly, they reach foreign land but don't find anything of interest there and feel isolated. At the same time, they are very research oriented and scientific people. They approach spirituality in scientific manner and through lots of research and study. It is one of the most prominent Moksha Margi position. They are here to seek truth their own way.
Hope this helps. Thanks,