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Let’s look at important things here –
Jupiter - It is the most benefic planet and it represents all the auspicious things like Knowledge, Wisdom, Law, Guru, Spirituality, Religion, Philosophy, Literature, Elderly People and Children etc. For a girl, Jupiter also represents Husband.
Uttara Ashadha Nakshatra - It is a nakshatra of career driven people. People who look for authority in life and are highly ambitious. Please check this link to get more information on Uttara Ashadha Nakshatra - https://www.astrosaxena.com/uanaksh.
Sagittarius - As Uttara Ashadha is part of Sagittarius sign, Sagittarius and things represented by Sagittarius are important here. Sagittarius is the 9th sign of Zodiac Belt, hence it represents many things related with the 9th house of horoscope like Religion, Knowledge, Wisdom, Higher Learnings, Gurus, Teachings from your Father etc. Besides it also represents Coaching, Universities, Professors and Preachers, Higher Wisdom, Written Law of the Land etc. Sagittarius has 2 and half nakshatra which are Mula, Purva-Ashadha and Uttara-Ashadha. Sagittarius' lord is Jupiter.
Capricorn - As Uttara Ashadha is also part of Capricorn sign, Capricorn and things represented by Capricorn are also important here. Capricorn is the 10th sign of zodiac belt, hence it represents many things related with 10th house of horoscope like Law and Order, Government, Authority, Organisation, Discipline etc. Besides it also represents World outside your home and people, Fear and Anxiety etc. Capricorn is consisted of next 2 and half Nakshatra, i.e. Uttar-Ashadha, Shravana and Dhanishtha. Capricorn is ruled by Saturn and that's why it represents Fear and Anxiety.
Sun - As Sun rules Uttara Ashadha, Sun's position and dignity is important to know about the overall functioning of any planet in Uttara Ashadha.
Jupiter - As Jupiter rules Sagittarius, their position and dignity is important to know about the overall functioning of any planet in Uttara Ashadha/Sagittarius.
Saturn - As Saturn rules Capricorn, their position and dignity is important to know about the overall functioning of any planet in Uttara Ashadha/Capricorn
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Jupiter in Uttara Ashadha Nakshatra – Jupiter is here in nakshatra of friend Sun. In Sagittarius sign, it is in own sign but in Capricorn, it is in debilitation. So, we can say that Jupiter is stronger in Sagittarius section of this nakshatra but Jupiter in Capricorn portion can be troublesome. Common theme with Jupiter in Uttara Ashadha is that person wants to gain high authority and recognition through his knowledge and education as it is nakshatra of authority and recognition. So, the desire of gain of authority and recognition is expanded due to Jupiter's expansive nature. Now, the difference could be in the ways adopted.
Jupiter in Sagittarius portion can be a person of high morals and values. He would like to gain authority but for that he will follow all the right/moral ways to achieve it. As Jupiter gets debilitated in Capricorn, person's moral/values can be weak too, This person can adopt wrong/illegal/immoral ways to achieve that authority and recognition. Also, Jupiter in Sagittarius section of this nakshatra can be open and willing to share his knowledge with others but Jupiter in Capricorn section can be rigid or not-so-sharing of knowledge. He will share only when he sees any benefit. As Jupiter in Capricorn/Uttara-Ashadha is directly opposite to Jupiter in Cancer/Pushya where Jupiter is exalted, these people can have traits and characteristics which are opposite to exalted Jupiter. It means that they can be mean about sharing their knowledge with others unless they get a return for it. They can be low on morals or values. They may not even value right guidance/advice. At the same time, these people can gain good authority and recognition as that is what they are looking for. Saturn's lordship can delay this recognition but if they show perseverance, they can get it.
In relationship matters, Jupiter in Capricorn section will be more difficult as it is debilitated there. Otherwise also, as Uttara Ashadha is ruled by Sun which represents Ego, Jupiter in Uttara Ashadha nakshatra can expand someone's ego. This can be ego related with authority and recognition in career and then it can lead to ego clashes in relationship.
Role of Sun – Sun placement is important to guide Jupiter in right direction as it is lord of Uttara Ashadha
Role of Jupiter - As we are trying to interpret Jupiter only, we need not to check Jupiter's position separately as Sagittarius lord.
Role of Saturn - Also, Saturn placement is important to guide Jupiter in right direction, being Capricorn lord.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Jupiter in Uttara Ashadha. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Jupiter in Uttara Ashadha can work in a chart.