"Sun signs alone cannot determine compatibility. There's so much more. "

Very true, I would go as far as saying that sun signs have very little to do with anything actually. They are the foundational energy applied to every aspect of the person. If you are that person you can spot that energy well, but when dealing with others you may get a totally different picture about them, based on which parts of them you interact with and which part of their energy is manifesting in those situations. Interms of analysing relationships (both friend and beyond) a person's moon and rising sign seem to be the most important to me. The moon sign is the person on the inside and how they deal with themselves and where their emotions lay. The rising sign is the natural first intuition / "gut feeling" of the person, and often how they appear or carry themselves through on the outside.

My first serious love relationship was with a cancer girl, I don't know the rest of her chart to explain the rest of her behaivior, but cancer can be the sweetest, homeliest and secure feeling relationship ever, one of the tenderest connections i've experienced, but then my moon is a pisces and pisces and cancer tend to go very well in their aloof aspects, so I felt at home and comfortable there - but the sagitarius aspect of me, after some time, began to notice my energy being stifled... in life my biggest fear is a routine, if I fall into a routine I feel trapped in a cage and become very depressed... I also notice cancer as being very illogical when in trouble, and their worst characteristic is going into their shell, denying anything you possibly try to help them. Being very logic and ideal oriented, I also felt very detatched from how a cancer deals with themselves and with the world, ultimately, the deeper part of the relationship was lacking due to cancer's insecurities and stubbornness. I've grown to have a little contempt for a cancer's self pity...and feel a little sadness too as its all in their own head, but they will feel too bad about themselves if they try on another's, and so they won't.

If you are a sagistarius with a cancer moon though, you naturally will vibe well with the moon children. You'll definately feel that inner understanding that is so hard to find. If your partner's moon relates with yours you'll have a very deep inner understanding with that person.