Natal Venus house is the sign where your Venus was placed during birth time, and from there other houses are calculated clock-wise.
If you were born with Venus in Libra, then your natal Venus house is Libra (Thula Rasi) and during transit, Sun forming conjunction (in libra), sextile (aspect of 60° which are Sagittarius and Leo in this case), square (aspect of 90° which are Capricorn and Cancer here), trine (aspect of 120° which are Aquarius and Gemini here), opposition (aspect of 180° which is Aries 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 Venus : You will be personally involved in Social, Artistic, Romantic activities. There is also a chance to find new partner.
Emotional gratification and attempt to find new acquuaintances can be possible.
You will be able to attract money and material possessions.
Combust Venus can make you extravagant and associate people with questionable past.
If this Sun is adversly aspected by malefic planets in transit, useless pursuits for pleasure can be experienced.
Transit SUN Sextile Natal Venus : Good time for social activities, art, music, literature and romance.
Best time to establish permanent relations with opposite gender and sort out misunderstandings.
You will be affectionate, charming, happier and optimistic during this month.
Transit SUN Square Natal Venus : This is not a good transit. Lack of endeavour and indulgence in pursuits of pleasure can bring trouble.
Lack of domestic harmony, emotional differences with partners, possibility of breakage in relationships.
Expenditure can upset your budget.
This month is best time for introspection and avoid upsets, frustrations.
Few can suffer from digestive and urinary problems due to over sexual indulgence.
Transit SUN Trine Natal Venus : This is a favorable period. Good health, romantic and social activies are highlighted.
This month is good for recreation and buying fancy dresses, home decor, furniture etc.
Plan few social events.
Opposite gender will appreciate your concern and mood.
Few romantic relations formed now, can go for long term.
Transit SUN Opposition Natal Venus : This brings bitterness between lovers.
There is scarcity of money and lack of emotional sensitivity.