Sun in 9th house in Astrology makes a person well-versed in religion and following the righteous path. Sun in 9th House in Vedic Astrology also gives a very high educational status to a person, usually, like people in the law field with this placement, as Sun is the king and 9th house is about law and order. A very good relationship with the father can be seen from this house as a father will be very helpful to one's own career.
The 9th house in Astrology shows interest in religion, long-distance travel, and higher philosophical education. This house rule advance education like PhD or master's, but also the education that brings wisdom in one's life, whether negative or positive, which depends on the planet and signs that rule this house.
The 9th House in Vedic Astrology also represents the law field as the sun in 9th house is about doing the right things or being punished for it. It's the house of your gurus as in teachers and teachings of your father. After marriage, a lot of readjusting is required. There is a separation of the family one was born in, and one's own stability and integrity are tested. It is a stage in life that can be very vulnerable. If one does things right at this stage, the foundation is in place for long healthy life.
This stage is a junction point of past and future, and the 8th house indicates Astrology for that reason. The 8th house in Vedic Astrology corresponds to the lowest part of the trunk, the genitals, anus, and eliminatory system. Scorpio corresponds to the 8th house. Fixed, but ruled by the forceful Mars, add the signification of sudden calamities to the 8th house. On the positive side, the sharp and analytical Mars can also add an element of research to this house.
Sun in Vedic Astrology represents the soul. This can be read in the most flexible and general sense of the word. The word soul is used for the deepest and truest nature, for the ultimate sense of identity, inspiration, and aspiration. Surya signifies one's essential attributes - the sense of self, ego, self-esteem, a sense of purpose, and so on. Energies and conditions that arise from the Sun's placement in a horoscope, along with the influences that the Sun receives, will be experienced in life as deep, long-term trends and processes that impact one's life as a whole.
Note: The degree of auspiciousness and inauspiciousness will depend upon a complete analysis of the horoscope (birth-chart).