1. The zodiacal signs are divided into four groups called "triplicities," and in their order they represent the four elements, fire, earth, air and water.

Fiery Triplicity is composed of Aries, Leo, and Sagittarius

Earthly Triplicity: Taurus, Virgo, and Capricorn

Airy Triplicity: Gemini, Libra, and Aquarius

Watery Triplicity: Cancer, Scorpio, and Pisces