As planets move across the sky - from the Ascendent up to the MC and then down to the Descendent - their vitality weakens and they lose their power. The 7th house is a symbol of closing of affairs, end of workday, everything that happens after sunset (ex. social events).
This house lies right across the sky from the 1st house and therefore represents the Other -a marriage partner, a business partner, marriages, contracts. In the larger scheme of things, the 7th house represents everything that isn't you, that feels like the exact opposite of you. On one hand, there is a hostility in the relationship. On the other hand, we are shaped by our opponents.
Imagine the natal chart as a circular table. Planets in the 1st house are the king, planets in the 7th house are those political players that dare to stare down the king. However, looking in someone's eyes for so long can also lead to falling in love and feelings of intimacy.
SUN
The Sun in the 7th house creates an individual whose sense of self is tied to who they are within their one-on-one relationships. The role that they play in this relationship is the core of their sense of self-worth. They need respect and validation from their partners. There is increased desire to connect and collaborate. This placement is usually a good omen for marriage, long-term relationships, and business partnerships. The people they chose will usually be successful and charismatic.
The danger with this placement is to focus too much on the partner and lose yourself trying to please them or to answer their expectations which may feel foreign to your personality. Sometimes there can be overemphasizing of the importance of others' opinions. Sometimes the Sun in the 7th house person might be in a relationship just because they need to have a partner not because they have genuine feelings for the person. There is a strong craving for partnership. They seek relationships for relationships sake but also a lot of interaction of any any kind.
This is a very social placement. Skilled negotiators, they know how to strike just the right balance in business partnerships and easily attract collaborators.
MOON
Moon in the 7th house creates people whose emotional wellbeing is rooted in their relationships with other people. Having a partner makes them feel safe. Being left alone is their greatest fear. They need deep bonding because they know how important their partners are for their overall emotional frame of mind. There may be an inclination to emotional co-dependency in partnerships.
Sometimes, with the Moon here, hidden motives and agendas in relationship can be suggested. With the Moon in this house, emotional needs are met through and within partnerships. It is impossible to feel wholesome without a partner. Without someone to care for them and someone they would care for. These chart holders need relationships with other people in order to feel comfortable with their own lives. Interactions with partners comfort them.
MERCURY
Mercury in the 7th house creates a person who bonds with others through communication. These people have the indeed to talk to their partners and engage in intellectual exchanges with them in order to feel connected. With this placement, we are attracted to Mercurial people who read a lot, know a lot, have curious and flexible minds. People who like to analyze and comment on the world around them. Satisfaction with the relationship comes from satisfactory discussions.
Mercury is also known as the trickster of the zodiac, so with this placement, the risk is to attract people who are in some way deceitful and dishonest. With this placement, romantic relationships are less emotional and passionate and more rational and friendly. In some cases, having Mercury in the 7th house may attract people with the opposite qualities (more Neptunian) so people who are more intuitive and who like to live in dreamy, metaphysical words.
VENUS
Venus in the 7th house creates people who approach relationships in a Venusian way - they like partnerships where they can be intelligent, diplomatic, artistic, poised, and in general, where they can look put together. Relationships where the exchange is charming, fair, balanced, polite, nothing is too intense or taken to extremes.
Venus likes this placement as it allows her to display all the qualities that she is known for - diplomacy, grace, fairness, beauty. With this placement, there is idealism when it comes to relationships which can attract equally idealistic partners and result in beautiful relationships. But it can also cause disappointment upon finding out that not everyone has the same sensitivity to measure and balance.
Venus treats relationships with finesse but not with emotion. There is a tendency to see the best in people and to ignore the negatives. In business partnerships, these people shine with great negotiation skills and a talent for designing partnerships that benefit both parties equally.
MARS
Mars in the 7th house people search for relationships that can keep them on their toes, that keep their adrenalin high and challenge them. Playful rivalry is a common dream with these placement. Relationships that push you out of your comfort zone and stimulate personal growth. Mars is passionate so intense sex life is also suggested.
Mars in this house can play out in generally two ways. The positive way is by giving relationships the “us against the world” vibe. Mars here is protective and courageous in the name of the partnership. The negative way that this can play out is that there can be competition and even aggression between the partners, desire to outdo the other and emerge as the sole winner. Desire to see every disagreement as a war that has to be won.
In business partnerships, the line between competition and sabotage may get blurry. Mars can go to extremes and forget about fair play and respect thereby sparking power struggles. In business, these people can be aggressive salespeople and lawyers.
JUPITER
Jupiter is the 7th house brings the understanding that relationships should expand your horizons and that accepting someone else into your life is about life getting bigger an better. The partner should add value to your life by expanding your horizons. Relating happens on the basis of shared interest in philosophy, world events, travelling and all sorts of cosmopolitan themes. Partners with larger than life vibe are preferred.
Jupiter here can suggest abundance coming through marriage. It can also suggest that the individual will have many associates, business partners, lovers or alliances. Jealousy is rare and freedom is readily given. Drama-free arrangements are strongly preferred.
The negative side is that too much space given to partners may result in the relationship falling apart out of neglect. It can make the individual seem irresponsible and not serious about the alliance.
SATURN
Saturn in the 7th house brings seriousness and maturity to relationships. People with this placement take one-on-one relationships seriously and approach them with a long-term vision and readiness to put in the hard work for the final success. Saturn doesn't expect to get anything without continuous consistent hard work and that is true of alliances as well. Relationships are projects to be build and then watered regularly if they are to succeed. Partners with similar understanding are preferred. Which is why very often these people are attracted to older lovers or associates.
They tend to marry later in life. They seek loyal, mature partners who have outgrown the need to chase and flirt for the sake of it. However, as these chart holders mature, their confidence and wisdom grow and they may leave their older partners in search of more equal relationships. These people often find more success in relationships later in life.
URANUS
Uranus loves freedom so the idea of one-on-one partnership is approached with caution. They like novelty, innovation, regeneration and movement so traditional commitments are a bog-down. Uranus likes groups and social networks but strictly one-on-one arrangements feel suffocating. They prefer partners who are mentally agile, stimulating and constantly on-the-go. Sharing their busy agendas together is the way to stay connected. Overly emotional people are avoided.
Uranus is the planet of the outsider. It does things in its own way and is not afraid to stand out and meet with criticism.
In terms of transits and destiny, the placement suggests major sudden changes in relationships. Former partners can switch alliances and become enemies. Relationships can be superficial at times. People with strong Uranus here tend to have a non-committal attitude to relationships and to refer to their boyfriends and girlfriends as just friends.
NEPTUNE
Neptune in the 7th house is idealistic about relationships. Relationships are seen as soulmate connections and associated with high ideals, dreams and romance. Partners are idealized and there is a tendency to like suffering for love. This placement brings compassion and empathy.
Unfortunately, Neptune’s idealism may be perceived as naivete that other people might wish to exploit for their own benefit. Feeling used is commonplace.
Neptune is about emotional healing. There may be a desire to heal the other person and so attraction to darker, more abusive and broken people is common.
In terms of business partnerships, Neptune here can indicate hidden enemies and someone you idealized turning against you. Also, betrayal.
PLUTO
Plutonian relationships are intense, passionate and difficult to let go of. Certainly not for the faint-hearted. People with this placement are often drawn to partners who can transform, shake them and make an impact on their lives. They are all in or all out, and like equally intense partners.
Pluto is about power, and Pluto in the 7th house makes the individual fond of people who are successful, powerful and forceful. People who ooze intensity. They have no interest in mellow, run-of-the-mill romances. Mental, physical, emotional, and spiritual depth is demanded.
Plutonian influence can also bring obsessive and possessive behavior. Relationships can turn all-consuming and can be marked by power struggles. The key is to remain in control of yourself and not let the relationship struggle become the focus of your life.
Pluto is psychic, great at reading people and their intentions, acutely aware of the subtleties of human relationships and as a result they have a hard time trusting others. Any person is a possible threat, and the best defense is to always have more power.