"You'll find her
midst constellations of
Gemini and Leo,
swooned by the queen of night"
^ Nice way to describe the location of Cancer. I like these opening lines because you pull the reader with you, to search for this constellation in the sky.
Loved the "s"-sound that was evident throughout these lines. It creates a smooth flow. I was especially fond of the word "swooned" as it's not often used.
The only thing that made me stop reading was the lack of an article before "night". I'm not much a grammar-geek but the lack of this article made me feel that the tone was too omnipotent. I noticed this before because of the word "midst", which is archaic, but I ignored it. I guess the lacking article before "night" just made me re-notice it. I could totally understand that you don't like a double "the" in the same line, though. So it's really up to you whether you think it sounds better with or without the article.

"speaking flowers fluently,
while tossing ruby stones"
^ It seems like you're describing a very beautiful girl/woman here, in all her femininity. I first found it rather humorous because it seems as if "flowers" is a language. I think you're referring to this person's frequent use of flower symbolism in her language?

"'neath her heart swollen
with untamed affection -"
^ I think you need a comma before "swollen", as you're going on with a different image after the word "heart", although it still relates to the heart. But if you feel like it would affect the flow you could also move "swollen" to the next line.

"or perhaps you'll find her
swaying 'tween branches of
summertime and a ripened fall,"
^ I really like the movement that's felt in this piece. Both due to its meter and its imagery. I found myself thinking of the wild nature, perhaps the jungle.
At first I wasn't very sure about this, although I loved it, since you were still talking about the constellation Cancer. It's odd to find Cancer (basically a crab) swaying between branches. Then I noticed the "or perhaps you'll find her ..." and found it cleverly done. I didn't notice this first, but I think you were objectively describing the constellation in the first few lines, then gradually went on about its character (perhaps the untamed affection) and then you talked about the girl/woman herself. There's a nice contrast between the two halves of this poem.

"dreaming of lust for it's
all she believes in -
it makes her beautiful."
^ Short and to the point, re-emphasizing the character of the person you're talking about, and telling the reader it's the way you love her and that's just it. No nonsense added; I like that. :)

Temps this was great..I was gonna pick it apart and talk about everything I liked and get indepth with comments, but I found I liked entirely too many lines and I would have repeated the same thing. I really like the tone you chose for this poem. I specifically like the subject of your poem. WHo would of thought to write about their zodiac sign? Very interesting. I loved it!! First poem I've read in a while, I'm glad I chose this one!

Interesting piece of work, it was enjoyable to read done with originality and imagination . Great flow and wording.
Connie