In Astrology, a distinction is made between three modes of vibration, which are linked to the very rhythm of Nature and the seasons. With time and experience, different energies can be observed in those born at the beginning, in the middle or at the end of a season. The signs known as "cardinal" open each season; "fixed" signs occur as the season is blossoming; "mutable" signs end the cycle while preparing for the next one.
The cardinal signs are Aries (at the spring equinox), Cancer (at the summer solstice), Libra (at the autumnal equinox), and Capricorn (at the winter solstice). They open every season, and they are the symbol of beginnings, rebirths, starting, impulses, and actions. The cardinal signs are passionate, enthusiastic, and strive to achieve their goals.
The "fixed" signs are Taurus, Leo, Scorpio, and Aquarius. They are located mid-season (May, August, November, and February) and symbolize its development. These signs are stubborn. They never let go, and rarely move back. Sometimes uncompromising, with something rigid in their behavior.
The "fluid" signs are Gemini, Virgo, Sagittarius, and Pisces. They finish the season (June, September, December, and March) while preparing for the next one. These signs are naturally willing to see their world change and adapt to new living conditions, being particularly opportunistic.