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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 Phalguni - Uttara Phalguni is nakshatra of hard work, realistic approach and practicalities of life. It is also nakshatra of agreements, deals and conflicts. For detailed information, please check this - https://www.astrosaxena.com/uphnaksh.
Leo - As Uttara-Phalguni is a part of Leo, Leo sign and its representations become important. Leo is 5th sign of zodiac belt, hence it represents the things associated with 5th house of horoscope like Love, Creativity, Arts, Being on Stage etc. Besides that, Leo is basically the Lion. This is the sign of feeling like King or Queen. Also, it is a sign of independence, Confidence, Ego, Self Esteem etc. Leo is consisted of 2 and half Nakshatra namely Magha, Purva-Phalguni and Uttara-Phalguni. Leo's lord is Sun.
Virgo - As Uttara-Phalguni is also a part of Virgo, Virgo sign and its representations also become important. Virgo is the 6th sign of zodiac belt, hence it represents almost all the things which are represented by the 6th house of horoscope like Debts, Diseases, Obstacles, Serving the under-privileged, Service Life, etc. Besides this, Virgo represents analytical or critical skills of people, being perfectionist and healing abilities. Virgo's basic representation is the lady coming in boat with wheat and herbs in her hands. So, Virgo is basically a sign of healing. Virgo consists of next set of 2 and half nakshatra. i.e. Uttara-Phalguni, Hasta and Chitra. Virgo's lord is Mercury.
Sun - As Sun rules Leo and Uttara-Phalguni, Sun's position and dignity is important to know about the overall functioning of any planet in Uttara Phalguni/Leo.
Mercury - As Mercury rules Virgo, Mercury's position and dignity is important to know about the overall functioning of any planet in Uttara Phalguni/Virgo.
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 Phalguni Nakshatra – Jupiter is in friendly nakshatra/sign in Leo portion here but it will be in enemy sign in Virgo portion. As it is nakshatra of hard work, working with details/analysis, especially in financial/legal field, and as Jupiter represents expansion, this position can expand person's ability to work with details and being analytical. This can give a person knowledge in analytical field. In Leo section, they will try to gain authority, recognition and fame through this knowledge and in Virgo section, they will be more about putting best efforts to serve people in these fields. They can be highly perfectionist too and can work in banks, financial organizations or stocks/shares. This can expand their ability to work hard. They can also become teachers/counsellors in these fields.
In relationship matters, as most of Uttara Phalguni falls in Virgo sign where Jupiter is in enemy sign of Mercury, it shows a relationship of frustration for them. It is not as serious enmity as Sun-Saturn or Mars-Mercury, but this enmity can make someone feel frustrated or disconnected in relationship matters.
Role of Sun – Sun placement is important to guide Jupiter in right direction, being Uttara Phalguni and Leo's lord.
Role of Mercury - Mercury placement is important to guide Jupiter in right direction, being Virgo's 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 Phalguni. 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 Phalguni can work in a chart.