The Four Temperaments in Astrology

The pre-astrological roots

The four temperaments do not originate in astrology. They come from ancient Greek medicine. The Hippocratic school, writing in the late 5th century BCE (the relevant text is On the Nature of Man, attributed to Polybius, a student of Hippocrates), described four bodily substances as the basis of health and character: blood, yellow bile, black bile, and phlegm. An excess of any one humor produced a particular type of constitution and behavior.

Aristotle, in On Generation and Corruption (4th century BCE), provided the elemental framework that sits underneath both medicine and astrology: four primary qualities — hot, cold, moist, dry — combined into four elements. Fire is hot and dry. Air is hot and moist. Water is cold and moist. Earth is cold and dry.

Hellenistic astrologers inherited both systems. By the 2nd century CE, when Ptolemy wrote the Tetrabiblos, the qualities of the planets and signs were described in precisely these terms, and temperament had become a standard part of natal interpretation.

How Ptolemy assessed temperament

In Tetrabiblos Book I, Ptolemy assigns elemental qualities to each planet. Saturn is cold and dry. Mars is hot and dry. Venus is moist. The Moon is cold and moist. These are not descriptions of personality. They are descriptions of the physical quality each planet imparts to whatever it influences.

In Book III, Ptolemy turns to the temperament of the native directly. His method is not a simple count of planets by element. He weighs several factors together: the sign rising on the Ascendant, the planets located in or closely aspecting the Ascendant, and the phase and condition of the Moon. Each factor can shift the reading. A fiery Ascendant points toward choleric. A strongly placed, angular Moon in a water sign pulls toward phlegmatic. The astrologer weighs these and arrives at a judgment.

Ptolemy is explicit that the Ascendant is the primary starting point. It shows the quality of the constitution as it presents itself to the world. Galen, writing at almost exactly the same time in De Temperamentis (2nd century CE), systematized humoral medicine along the same lines. Ptolemy and Galen were working within a shared intellectual framework where medicine and astrology used identical categories.

The four types

Choleric (fire, hot and dry). Quick to act, direct, prone to initiative. The natural mode is forward motion: toward problems, toward people, toward action. The excess is too much heat. Rushing decisions, overestimating capacity, or burning through energy before the task is finished.

Sanguine (air, hot and moist). Mentally quick, socially easy, adaptable. The natural mode is connection: between ideas, between people, between contexts. The excess is too much moisture. Spreading attention too thin, or committing to more than can be sustained.

Phlegmatic (water, cold and moist). Calm, perceptive, oriented inward. The natural mode is to read a situation and adapt to it rather than take charge of it. The excess is too much cold. Passivity, or absorbing the emotional states of those around you rather than holding your own ground.

Melancholic (earth, cold and dry). Methodical, enduring, focused. The natural mode is consolidation: building, maintaining, holding a course. The excess is too much cold and dry. Excessive caution, difficulty adapting, or staying with a situation long after it has stopped working.

Mixed temperaments

Ptolemy does not expect pure types. He is clear in Book III that most natures are mixed, and that the astrologer's task is to identify which element dominates and how the others modify it.

The secondary element matters. A primarily choleric person (fire Ascendant) with several planets in water signs is more perceptive and emotionally attuned than a pure choleric. The same fire Ascendant with secondary earth is more patient and thorough. Secondary air adds mental speed and social ease. The same heat expresses differently depending on what accompanies it.

Looking at which elements the seven classical planets occupy (Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn) gives a picture of the elemental balance across the chart. Vettius Valens, in his Anthology (also 2nd century CE), consistently works with these seven planets as the operative factors. Outer planets (Uranus, Neptune, Pluto) were unknown to ancient astrologers and are not part of this system.

See your temperament in your birth chart

The Hellenistic birth chart follows Ptolemy's method: the Ascendant sets the foundation, the Moon's phase is factored in, and the chart ruler and aspecting planets add their qualities. Your temperament is calculated alongside sect, essential dignities, and Whole Sign houses.

If you do not know your birth time

The Ascendant is the most important single factor in Ptolemy's method. Without a birth time, you cannot calculate it. You can still assess the elemental balance of the seven classical planets. If six of seven fall in fire and air, the constitution tends warm. If they cluster in earth and water, it tends cold. This gives useful information, even if incomplete by Ptolemy's standards.

If you do not have a birth time but want to estimate your Ascendant, the rising sign quiz uses physical appearance and behavioral tendencies to suggest a likely rising sign.

Sources

• Hippocrates (attrib.), On the Nature of Man, late 5th century BCE
• Aristotle, On Generation and Corruption, 4th century BCE
• Ptolemy, Tetrabiblos, Books I and III, 2nd century CE (F.E. Robbins translation, Loeb Classical Library)
• Galen, De Temperamentis, 2nd century CE
• Vettius Valens, Anthology, 2nd century CE (Mark Riley translation, available open access)