Why are the Constellations chosen?
Excerpt: They were chosen because these are the signs that the ecliptic of the sun moves through them... And because the Earth's Pole points towards these signs as it wobbles around... -- So there are 12 signs of the zodiac. They were chosen because these are the signs that the ecliptic of the sun moves through them [Yellow]. And because the Earth's Pole points towards these signs as it wobbles around [Blue]. Giving these constellations an energy storehouse of direct sun energy. Therefore causing more of an effect on earth as they are stronger. Though the sun actually goes through 13 signs. NOW. The reason why the 13th sign Ophiuchus isn't added is because he is fused into the definition of Scorpio already. So if you have 13 signs, you lose being able to have basic compatibility ...