Like a retired librarian, I will explain it affectionately.For astronomy, there are twelve signs of the zodiac, each one for one specific month and symbolized in the night sky by a respective constellation.Notable ones are 'Aries,' 'Taurus,' and 'Gemini.' Every last one has character, quality, and personality that people tend to strike a chord with be it in some form or another.Just as in a novel the person's hidden depths, strengths, and weaknesses are behind every zodiac sign.