Mars is widely known as the planet of energy, aggression, and action. When placed in the 9th house for Capricorn Lagna, Mars operates from an enemy sign state with Cancer being its opposing sign. This placement suggests that while the native may be confident and enthusiastic about their beliefs and philosophies, they may encounter significant obstacles and conflicts in pursuing them.
As Mars is the lord of the 4th house (houses related to emotions, mother, property) and 11th house (houses related to gains), it indicates that the native could feel rather possessive about their properties and attachments. The native could involve themselves into numerous activities on account of their inclination towards financial gains. They would put in abundant effort in this regard, but there could still be struggle since Mars is not particularly comfortable in Cancer sign.
Furthermore, being a natural karaka for houses 3rd (house related to courage/boldness) and 6th (house related to daily life routine/healthcare), Mars would generally stay active regarding these aspects. They will boldly assume challenges coming their way; however, excessive competitiveness might negatively impact their mental health issues –specifically related to mood swings or depression– given Mars’ aspecting liaison with '12'‘the house of loss’.
By Jupiter’s grace, the presence of Mars in this position can also signify that they will have opportunities to travel significantly- either for work or pilgrimage purposes due to ninth lord affiliation with his own karaka bhava - 9th house.
Though its connection with the Karakas may aid the native's biological traits like healthy weight management by planet Saturn’s influence on cancer via Putrakaraka association with Kendra Lordship over Saturn ruled Ascendant for Capricorn natives - indicated by Mars' aspect on '3', which represents individuals' strength & stamina levels.
In terms of personal relationships or business associations- wherein houses like the 2nd, 5th and the 7th signify some parameters of such relationships- Mars placed in this house can imply that the native might get impatient and restless when such affairs do not yield expected outcomes. Thus, any intimate or public alliance will be subject to conflicting circumstances
Consequently, we can infer that Mars's placement in the Capricorn Lagna’s ninth house requires diligent insight on every single circumstance. Although it could lead to financial gains through improving commercial ideas as result of associated impulsiveness inclination towards business opportunities. It is important to note that there may be times where stress and anxiety arise due to a competitive attitude towards life. Given these potential situations, one needs suitable guidance from a learned astrologer, who upon assessing many other facets of the birth chart could counsel you with apt remedies, balancing mantras/chants and stones depending on your interest.