Do Opposite Signs Attract?
In assessing Sign Compatibility opposite or "opposing" signs are a special case. They're not really "exact" opposites, but "complementary" opposites - meaning they "complete" each other. They have qualities which are similar in "function" but opposite in "execution", so to speak.
It's like two people who pull on opposite ends of a rope - they may pull in opposite directions, but at least it's on the same rope! They keep each other in balance because, even though they challenge each other, they do it along the same lines. There is something in common, even if it is approached in different ways. You can learn a lot from "the opposition".
Don't Judge by Sun Sign Alone!
These are the six pairs of Opposite Signs:
Aries/Libra, Taurus/Scorpio, Gemini/Sagittarius, Cancer/Capricorn, Leo/Aquarius, Virgo/Pisces.
When your Sun Sign is in the Sign which is opposite another person's Sun Sign, you are "complementary opposites". What you lack, they may have. And what they lack, you may have. This can create a kind of "mutual admiration" and attraction, and can make you two a strong "team" in business or marriage.