posted March 13, 2013 06:49 PM
Try astro-click partner on astro.com for composite charts 
Don't forget to look at the composite in extended chart selection and note that the minor aspects are just as important as the major ones, and give them the same interpretation.Try grupovenus.com, astrology3d.com and armonics.it (use google translate) for synastry 
You'll soon learn that composite shows how well two people's energy works and merges together. Synastry shows whether they will have substance or not. Composite shows how strong the container is, and synastry shows what the ingredients inside that container are. It defines what kind of relationship it will be...platonic, romantic, etc and the amount of chemistry between you. While composite shows the strength of your bond. A good composite without good synastry is nice and makes people be fond of each other, but is practically useless, as you won't be able to connect. Good synastry without a good composite is a wonderful feeling but one that'll never be realized, as the two people won't be able to come together. So if you check you should have both a great composite and great synastry with all the people who were important to you at some point in your life.
A quick lesson on composites: You want lots of conjunctions. A composite without a stellium will not be a very close relationship even despite strong attraction or chemistry. There are many possible stelliums, but the best types to have are those where the sun (the identity of the relationship and most important component of the composite) is conjunct jupiter or venus. Bc those two are the "benefic" planets in astrology. The malefics are saturn and uranus. Neptune conjunctions are not malefic, but negative neptune aspects are. Sun conjunct venus in composite is true love but sun in minor aspect or opposition to venus is interpreted as the conjunction as well. The three most powerful composite aspects that bring people together are moon trine or sextile pluto, venus trine pluto, and sun in hard aspect to pluto. If you have nothing else going on in the composite though, the relationship will not last and you'll feel like it was an illusion. Other than sun-jupiter and sun-venus conjunctions, the other configuration that creates a somewhat stable relationship is moon-venus in combination with venus-pluto. From my experience, sun-jupiter and sun-venus conjunctions are much more stable and long lasting though, while sun-venus is the most stable of all, being the only aspect to signify true love, as venus is literally, the planet of love, and the sun is the identity of the relationship. Aspects to the composite sun and moon count as far as 12 degrees because they are luminaries. And when it says +opp. house next to a planet on the list beneath the composite wheel at astro.com that means the planet can also be on the opposite side of the chart (in the opposite house) so consider any possible conjunctions it might also have.
In synastry, again you want to avoid the two malefic planets in negative aspect to any other planets. Double whammies or aspects occurring twice will define the entire relationship singlehandedly---grupovenus is a good way to find those quickly. Wider orbed aspects in synastry do count. Basically any aspect shown in the synastry wheel at astro.com counts. In synastry jupiter aspects are extremely important and the sun, moon or venus aspecting jupiter will create laughter, good will and fun times, esp the conjunction. The sun in positive aspect to the moon, jupiter venus pluto or mars is also very important in creating chemistry/closeness between two people, even negative aspects. Moon in positive aspect to asc makes two people very close, a "soul kinship" especially the conjunction. Moon and venus trine uranus is also very nice as is moon in negative aspect to venus. For a magical emotionally close feeling you want the moon positively aspecting the water planets pluto and neptune. "Venus-pluto" and "mars-asc Double whammies" are the IT aspects for sexual attraction. Venus-mars is hot too but less so, unless it's the conjunction. Sun-mars moon-mars and also "sun-pluto and moon-pluto double whammies" will create sexual attraction but also less so. If you have a lot of the previously mentioned aspects but none of the sexual attraction aspects i mentioned then you'll love each other but the physical chemistry won't be so great. It can also be the reverse. You can have great physical chemistry but not be able to connect that well emotionally.
Too much neptune is not good because the relationship will become platonic instead of sexual. Too much saturn is not good (even trines), because the relationship will feel dry and all work and no play.
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