Natal Jupiter house is the sign where your Jupiter was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Jupiter in Sagittarius, then your natal Jupiter house is Sagittarius (Dhanus Rasi) and during transit, Sun forming conjunction (in sagittarius), sextile (aspect of 60° which are Aquarius and Libra in this case), square (aspect of 90° which are Pisces and Virgo here), trine (aspect of 120° which are Aries and Leo here), opposition (aspect of 180° which is Gemini here) are discussed in this article.
Conjunction is transiting through same sign as in birth chart, sextile is transiting 3rd or 11th house, trine is transiting 5th or 9th house, opposition is transiting 7th house from natal sign.
Transit SUN conjunct Natal Jupiter : This is a favorable transit indicating success, fortune, optimism, improved social cirlce, benevolent attitude.
Time to exhibit leadership qualities and can successfully convince authorities to fulfill your obligations.
Also good time for financial dealings and Speculations.
If Jupiter is strong and well placed in birth chart, favorable time for spiritual and educational guidance. Children will progress well.
Commercial dealings, long distance business dealings are favored. Arrogance can increase if Mars conjuncts or aspects Jupiter.
There can be a setback due to your ‘Take it for granted‘ attitude.
Transit SUN Sextile Natal Jupiter : Gains through friends, relatives, government, superiors possible.
Hopes and desires will be successfull. Leadership qualities will be exhibited to a group. Good time to handle legal matters, financial speculations, long journeys for knowledge and spiritual progress.
There will be some connection with people in foreign countries or their culture.
Time to introspect future goals.
Transit SUN Square Natal Jupiter : This is not a good transit. Lack of discipline, over optimism, extravagance and an inflated sense of self importance define this month.
You will be blamed for ignoring others views and multiple failures.
This month promises more but delivers less.
Speculation will bring losses. Impractical attitude towards religion, philosophy, higher education will cause problems.
Transit SUN Trine Natal Jupiter : There will be some positive outlook, benevolence and good fortunes.
You will be more generous and help others. Gains from authorities possible.
Your intuition can help you set up right plans for future.
There will be some gains in long distance businesses. Good time to handle legal affairs, sign new contracts.
Transit SUN Opposition Natal Jupiter : You should not express views openly. Control impulsiveness and self importance.
Lack of caution and premeditation can bring losses.
Avoid moral hypocisy and help others without expecting anything in return.
Ego should not override personal views. Do not struggle for power as it can elude you.