aqua -Descendant is the exact opposite (even to the Degrees) as your Ascendant (Rising Sign).
It is also the Cusp of the 7th House.
"The Ascendant and the Descendant
The rising sign or ascendant in your horoscope tells much about your personality. This is the factor of the horoscope which speaks to how you will deal with the outside world. And your relationships are a most important part of that outside world. The ascendant degree on cusp of your first house begins the series of twelve houses and determines, to a large extent, the sign that will be on the cusp of each of the eleven remaining houses. The ideal match for you is the personality type denoted by the sign on the cusp of the descendant. The descendant in the horoscope is the sign opposite the ascendant. This sign rules the 7th house. The seventh house is the field of relationships and therefore it is the area of primary focus in a study of synastry. This house, opposite the first (matters of the self), relates to the other people with whom you enter close association. Indeed, the sign on the cusp of the 7th house is the personality type with whom you are most comfortable and best suited. This idea of opposites attracting is a very valid concept in astrology. A person whose chart is the mirror image of yours, has the natural tendency of dovetailing the alliance by filling needs to form a solid unit."
www.astrology-numerology.com/synastry.html
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