In Vedic astrology, the placement of Sun in 7th House for lagna Cancer is considered to be a challenging position. The Sun is the natural significator of authority, power, and ego. When it is placed in the 7th House, which represents partnerships and relationships, it can create some problems.
The first thing to note is that Sun is in an enemy sign state in this placement. This means that the energies of the sign Leo (which is ruled by the Sun) are not comfortable in the environment of Cancer. As a result, there may be some tension between one's sense of self and the needs and desires of their partner.
Another significant factor to consider is that Sun is the lord of houses [2]. In Vedic astrology, the second house represents family, wealth, possessions, and speech. With Sun as its ruler, these areas may become important for individuals with this placement. They may value their material possessions and wealth more than most people do. Additionally, they might demonstrate strong communication skills or have a particular talent for projecting confidence and charisma.
Sun also rules over houses [1] and [10], which are both critical places in a birth chart. The first house represents one's identity, physical appearance, and overall outlook on life. Meanwhile, the tenth house relates to career aspirations or public identity - how one wants to be known to others professionally or socially. With Sun taking care of these houses as well as its own ruling house [2], individuals with this placement can expect success and recognition in their chosen field/endeavors.
Furthermore, since this placement indicates leadership qualities through houses [1] & [10], individuals with this position need to watch out for taking over-power at their workplace or other realms where they hold power positions currently or aspire to hold such positions.
As per traditional Vedic astrology principles; astrologers believe that sun provides its ‘karakatwa' to the houses it is ruling. Therefore, for some lagna Cancers, Sun placed in 7th House can make them more family-oriented and protective towards their wealth and possessions while in others; where there are no planetary or other dispositonal detriments to Sun's functionality it would give authority, command and leadership through professions.
Finally, being placed in the seventh house, Sun aspects the first house of identity. This means that individuals may have a strong sense of self-belief and be quite confident in their own abilities. However this overconfidence could result to problems within partnerships/ relationships which would require caution & balance to get right.
In conclusion, individuals with Sun in the 7th House for Lagna Cancer need to balance their ego with their relationship goals to lead a successful life. They can use their excellent communication skills and charismatic personality traits to gain recognition in their professional lives but need awareness not indulge too much into materialism. In a partnership setting, They may want to be cautious about exerting too much control over their partners or putting too much emphasis on themselves at the cost of relationships. In general while showcasing leadership qualities one must remember they don't end up alienating people around them due to over enthusiasm or elevated ego levels overcoming reasonableness.