In Vedic astrology, the Sun is a prominent planet known for its attributes of authority, willpower, vitality and charisma. When it comes to interpreting the influence of Sun placed in 12th House for lagna Libra, we need to pay attention to its aspect on various houses too. This placement of sun is in neutral state since Libra is considered to be a friend of the sun according to zodiac sign compatibility.
The 12th House in the horoscope represents foreign travel or settlement, confinement or hospitalization, expenses or losses; isolation, seclusion, introspection, spiritual practices and enlightenment. With Sun occupying this house for Libra ascendant/ lagna natives, it indicates that they may spend their money on philanthropic causes, charity work or towards hospitals and prisons. They may also engage in long distance voyages frequently either for business or pleasure purposes.
As Sun rules their 11th House (signifies hope, gains & acquisition) and gives aspect to 6th House (signifies health & medical ailments), it can be observed that these natives tend to have difficulty managing their financial resources which can cause expenses on unexpected medical emergencies or sudden problems with employees/staff members which require legal consultation. However due to Sun's bright light in influencing these houses, they do recover from such situations relatively quickly as compared to others.
Since Sun is the natural karaka of Houses 1 and 10 - representing self-esteem and career respectively - their role becomes even more eminent here as an enhanced sense of self belief motivates them towards achieving professional success amidst obstacles. This placement suggests that they are enthusiastic about working towards attaining higher positions of power leading to public recognition and acclaim.
However due to being positioned in the 12th house there might be a tendency among these natives at times towards vanity leading them into aggressive decision making without much consideration resulting in resentment from their colleagues or team members causing disruption at workplace.
Overall, as Sun is considered a hot and fiery planet it can cause some turbulence in matters of the 12th house such as isolation, confinement, legal issues or expenses. However at the same time its influence may help these natives channelize their self-confidence towards philanthropic work or spiritual endeavours.
It is important to note that Astrology should not be relied upon solely for making decisions since this science only presents a probability factor and does not guarantee outcomes with certainty. It always depends on the individual's actions and other planetary positions in their respective horoscopes influencing them one way or another.