The primary categories by which the signs are classified are the four elements (earth, air, fire, and water) and the three qualities (cardinal, mutable, and fixed). Each of the 12 signs of the zodiac is a unique combination of an element and a quality (e.g., Aries is a cardinal fire sign, Taurus a fixed earth sign, Gemini a mutable air sign, and so forth). The elemental nature of a sign is said to refer to its basic temperament, while its quality refers to its mode of expression.
People whose only contact with the word element was in a science class immediately think of the materials diagramed by the periodic table—oxygen, iron, hydrogen, silicon, and the like—when they hear the term. It thus strikes them as strange to consider earth, air, fire, and water by this designation. The astrological elements derive from the elements of ancient Greek philosophy. Classical philosophy and modern science share an interest in discovering the basic—the "elementary"—building blocks of the world. Prior to the advent of contemporary atomic theory, intelligent people examining the world in which they lived observed that all tangible things could be classified as solids (earth), liquids (water), or gases (air). Sources of heat and light, such as fire and the Sun, seemed to constitute a fourth factor (fire), which can be thought of as "energy." When reworded as solid, liquid, gas, and energy, this ancient scheme of classification is not really so strange.
When the ancients analyzed the human being in terms of these four factors, it appeared to them that the physical body was earthy, feeling and emotions watery, and thoughts airy. The fire element provided the spark of life that animated the human frame with activity. From this way of looking at human nature, it was but a short step to regarding sensitive, emotional people as having more of the water "element" in their constitution than their fellows, mental people as having more air, practical people as having more earth, and energetic, active people as having more fire. When astrology was being systematized in ancient Greece, this "psychological" system was applied to the 12 signs, resulting in a classification according to the four classical elements: the fire triplicity, Aries, Leo, and Sagittarius (energy signs); the earth triplicity, Taurus, Virgo, and Capricorn (practical signs); the air triplicity, Gemini, Libra, and
One finds the same set of four elements and the same classification of signs by element in Vedic astrology. The connotations are basically the same as in Western astrology.
In contrast, there are five elements in Chinese astrology—earth, water, fire, wood, and metal. In this system, the elements are not permanently associated with each of the signs of the zodiac. Rather, each one of the 12 signs of the East Asian zodiac can be a different element. For example, an individual born as an Ox in 1949 is an earth Ox; an Ox born in 1937 is a fire Ox; an Ox born in 1973 is a water Ox; etc.
Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New
York: New American Library, 1980. Hand, Robert. Horoscope Symbols. Rockport, MA: Para Research, 1981. Tester, Jim. A History of Western Astrology. New York: Ballantine, 1987.
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