Today, 3rd house lord sitting in 10th house.

So first of all, let's see what 3rd house and 10th house represent -

3rd house - It is house of your communication skills, neighbors, short distance travels, younger siblings, marketing, announcements, collecting information, hobbies and skills, self-efforts, business, courage etc. At the same time, as 3rd house is house of efforts, this house shows that results of this house will come only when person will put lots of efforts for a long time.

10th house represents things like Government, Father, Authority, Fame 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.

One thing to remember here is that 10th house 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.

Now, what does it mean to have 3rd house lord sitting in 10th house?

It means the planet which rules/controls/owns the 3rd house of your horoscope is sitting in the 10th house of horoscope.

Now, what is the impact of having 3rd house lord sitting in 10th house?

This position links person's hobbies, interests and skills to his career as 3rd house lord is in 10th house. It means these people convert their hobbies into their career. This position also makes someone working with Government or Law or any other Authority and use his communications for work. It means these people can be those activists who continuously give representation and application to Govt or Courts. They can be Lawyer or Litigant both. As 10th house is also a house of Fame, it shows that person's hobbies, skills, interests and communications bring him fame in society.

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 10th house lord as 3rd house lord is going in 10th house. So again, Overall Chart Reading is important.

So, let's see how different planets will behave differently as 3rd house Lord in 10th house.

Sun - Suppose it is a Gemini Ascendant chart and Sun rules the 3rd house with Leo sign and sits in the 10th house in the sign of Pisces. It shows someone using his communications to deal with Govt on daily basis. So, it can be a Govt Employee or someone who fights with Govt. As Sun is in the sign of Pisces, this person's communication is going to be highly spiritual in nature. These people can be those RTI activists or like-minded people who take on social issues daily to Govt. Father of native may be a Govt Officer or in position of Authority.

Moon - So it is Taurus Ascendant Chart and Moon rules the 3rd house with Cancer sign and sits in 10th house in Aquarius. This person uses his communication to deal with Authorities but in large organisations or big group of people who take the cause of society to Govt. Here, communications become highly emotional. Person's mind is very research oriented. Mother might be working with or as an Authority. Communications and Research Work is dedicated to deal with matters of society.

Mars - Mars can be 3rd house ruler through its two signs. So, let's take both one after the other.

Aquarius Ascendant - So if it is Aquarius Ascendant, Mars rules 3rd & 10th house and sits in 10th house in Scorpio sign. This can show few things, like this person may have high interest in occult and may take it as a profession. Else he can be a surgeon or soldier by profession. This person's work environment involves chaotic working conditions. This person may have a transformative relation with his father. He always finds difficult to deal with Authorities.

Virgo Ascendant - Now if it is Virgo Ascendant, Mars rules 3rd & 8th house and sits in 10th house in Gemini sign. Exchange of energy between Mars and Mercury can either make this person an engineer or a tech guy. Else it can make someone a Lawyer or some activists. This position can show someone who has a very harsh speech and can get angry quickly. This shows some stress in relation with father.

Mercury - Mercury also can be 3rd house ruler through its two signs. So, let's take both one after the other.

Aries Ascendant - If it is Aries Ascendant, Mercury rules 3rd & 6th houses and sits in 10th house in Capricorn. This one strongly shows a person working with Govt, Authority or Law Agencies with his communications. This is a strong indication towards a Lawyer or Legal Activist as Mercury is communication and 10th house & Capricorn is Law and Govt. This person enjoys a friendly relation with Father but relation with younger siblings may go through some ups/downs.

Cancer Ascendant - If it is Cancer Ascendant, then Mercury rules 3rd & 12th house and sits in 10th house in Aries. This person takes his analytical skills and details oriented approach to his work. He wants to assert his individualistic approach at work, means he wants attention on himself. He has a very direct speech and won't spare any chance to use it. Relation with father and siblings might be same as above.

Venus - Venus also can be 3rd house ruler through its two signs. So, let's take both one after the other.

Pisces Ascendant - If it is Pisces Ascendant, Venus rules 3rd & 8th house and sits in 10th house in Sagittarius sign. Venus in 10th house becomes a natural indicator for someone working in Creative Field and in this case, it is even more prominent as Venus rules 3rd house of skills, interests and hobbies. But with this position it may not give its full result as Venus is in Sagittarius, kind of enemy sign for Venus. But they have great love towards philosophy and higher education. So, it may show a teacher or professor who is teaching in the fields of higher education. It also shows someone wife may be coming from same work environment.

Leo Ascendant - If it is Leo Ascendant, Venus rules 3rd & 10th house and sits in 10th house in Taurus. This one is best placement for creative career. Leo is sign of Creativity. 3rd house and 10th house both are ruled by Venus and Venus being a 3rd house lord sits in its own sign in 10th house. So, expect this person to take his hobbies, interests and arts to make a successful career. They keep a very pleasant relation with everyone at their work. Again, wife can come from same work environment.

Jupiter - Jupiter also can be 3rd house ruler through its two signs. So, let's take both one after the other.

Libra Ascendant - If it is Libra Ascendant, Jupiter rules 3rd & 6th house and sits in 10th house in Cancer Sign, where it is exalted. These people are best as Teachers as Jupiter (lord of 3rd house of communication and planet of teaching) is exalted in 10th house of Career. But as Jupiter also relates to Finance, these people can be in Finance field too, working for Govt. Actually, I know a horoscope with this position and person was 1st Govt Auditor and then after retirement became Teacher in Astrology. Extremely good position for gains from Govt and Teaching. Mother and Father both work as Guru for native.

Capricorn Ascendant - If it is Capricorn Ascendant, Jupiter rules 3rd & 12th house and sits in 10th house in Libra. This position can also make person a teacher but gains are not as good as earlier one. With this position, we can see a Relationship Lawyer or Counselor more as Libra is sign of relationship, 10th house is house of Law & Govt and Jupiter is Written Law. This can also make a person Judge in the same field, i.e. Family Court.

Saturn - Saturn also can be 3rd house ruler through its two signs.

In either sign (Capricorn/Aquarius) as 3rd house lord, Saturn in 10th house (for Scorpio/Sagittarius Ascendants respectively) shows that person may not have younger siblings. If he has, their contribution in native's life is negligible. It shows someone who can write lengthiest of Novels & Blogs and that work brings him fame. If they are in routine jobs, they are in a job setup where they have to do repetitive work daily, like doing same work without any use of brain. They can give the longest of speeches. They can write biggest of articles. But as always, in earlier part of their lives, this ability would be stuck and they would have to work really hard on their communication skills to receive any good rewards. Again, as always if person is ready to work hard, same Saturn blesses him with all the fame due to his communications from his mid 30s.

Rahu - If Rahu is 3rd house Lord through its sign Aquarius, as it co-rules Aquarius along with Saturn, and sits in 10th house in Virgo sign then 1st of all we need to make sure of Saturn's position as it is the main ruler. Rahu in Virgo in 10th house makes a person obsessive for Fame. This person can't live without spotlight on him. This person also becomes very detailed oriented and perfectionist. So, what it creates is technology geek who wants to invent newest super computer or most useful app for the betterment of all and that gives them fame. Their work environment may be related to Foreign/Unusual things. Relation with Father suffers. They are THE PERFECTIONISTS among all. Obsessed for perfection.

Ketu - Likewise, If Ketu is 3rd house Lord through its sign Scorpio, as it co-rules Scorpio along with Mars, and sits in 10th house in Gemini 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 working under any authority. Relationship with Father is not to talk about. Either they are physically separated from Father or they never find that mental connect with him. It is better for these people to either work for themselves and be their own authority or follow a spiritual career. They are the last people who are looking for any authority over any other.