Four Phases of Mercury’s Cycle

Two sides of Mercury: Prometheus and Epimetheus

Dane Rudhyar, a pioneer of transpersonal astrology, divided the cycle of Mercury into two important parts: one belonging to Prometheus, and the other to Epimetheus, two brothers in Greek mythology representing the symbolic “forethought” (Prometheus) and “afterthought” (Epimetheus).

Prometheus is the ambitious brother, the figure of foresight, planning, cleverness, rebellion, and creative defiance. He steals fire from the heavens and gives it to young humanity, thus enabling civilization – but also risking disruption and provoking the punishment of the gods. He represents the side of Mercury that is curious and proactive, igniting possibility.

Epimetheus is the more conservative and obedient of the two brothers, who receives the symbolic Pandora’s box from the gods and blindly accepts it, despite Prometheus’s warning. He represents the side of Mercury that is more passive, belatedly wise, or learning only after the damage is done. Epimetheus is afterthought: the one who receives the consequence, learns by aftermath, and turns experience into meaning.

Symbolically, Prometheus lights the spark, while Epimetheus fights the fires. And although they seem like polar opposites, in reality, they are just the two sides of the same cycle. One creates the future; the other inherits the fallout.

The two Greek brothers represent two extreme sides of Mercury: the one that seeks innovation irrespective of consequences, and the one that tries to play it safe and focus on learning from past experience. Both brothers act as symbolic messengers of the gods, bringing the gift of the heavens to earth, and thus reflecting Mercury’s unique position in the zodiac as the closest planet to the Sun. Prometheus brings his gift in an act of rebellion, while Epimetheus brings his in an act of obedience. Both, however, contribute to some kind of calamity that mankind gets to experience. The Promethean gift of fire and technological advancement eventually leads humanity to destroy the very world they come from: nature. The Epimethean gift of disease and mortality, given in response to the act of Prometheus stealing fire, is punishing in itself.

Prometheus’s gift is dangerous because it is both liberating and volatile without responsibility. Epimetheus’s gift is dangerous because it is seductive and unexamined. Both mythical brothers stand at the threshold where something divine crosses into human life, and both crossings transform mankind permanently. One gives us power with punishment; the other gives us desire with suffering.

The story of Prometheus and Epimetheus accurately describes two faces of Mercury, the planet of intellect – and reminds us that either extreme will have consequences.

The Cycle of Mercury

As Mercury moves throughout its 116-day cycle from its inferior conjunction with the Sun (symbolic “New Moon” or “New Mercury” – Sun and Mercury on the same degree in the zodiac, with Mercury in retrograde motion) to superior conjunction (symbolic “Full Mercury” – Sun and Mercury on the same degree while Mercury moves direct), and vice versa, the way we look at things evolves together with it.

Rudhyar saw Mercury as more Promethean in nature whenever it was behind the Sun in the zodiac, echoing the themes of Mercury forming a Vosi Yoga with the Sun. Whenever Mercury dwells behind the Sun, regardless of whether its apparent movement is direct or retrograde, it always takes place between Mercury’s inferior conjunction with the Sun (Mercury in between the Sun and Earth, with its dark side turned toward the Earth) and superior conjunction (the Sun between Mercury and Earth, with Mercury’s bright side turned toward the Earth). Mercury in this half of the cycle was seen by Rudhyar and other astrologers of those times as intellect that is future-oriented, visionary, and full of the Promethean spark of new, creative ideas.

Budha in the other half of its cycle, between Full Mercury (superior conjunction) and New Mercury (inferior conjunction), dwelling ahead of the Sun in the zodiac (and echoing the themes of Vesi Yoga), was seen as embodying the qualities of Epimetheus – the intellect that is more deliberate, reflective, objective, experience-based, and practical.

Thus, whenever direct Mercury reaches its maximum astronomical separation from Earth and moves in its fastest motion, approaching the superior conjunction (Sun and Mercury on the same degree, Mercury direct), it symbolically shifts from Promethean (innovative) to Epimethean (practical), marking the beginning of a period of review of our recent choices and inventions. Whenever Mercury goes retrograde, on the other hand, it initially intensifies the inner review and even awakens a hint of dissatisfaction, so that after the inferior conjunction (Sun and Mercury on the same degree while Mercury is retrograde), it can shift from Epimethean to Promethean and begin creating something new again.

Together with Mercury, we, too, go through three of these cycles every year: creating, quickening, expressing, understanding, reflecting, slowing down, and… creating once again.

Four Faces of Mercury

Michael R. Meyer, a contemporary Western astrologer, further elaborated on those themes by dividing the entire cycle of Mercury into Mercury’s four faces: Promethean Direct, Promethean Retrograde, Epimethean Direct, and Epimethean Retrograde – thus acknowledging that different flavours of Mercury are not only characterised by its Promethean or Epimethean phase, but also by its direct or retrograde motion.

Promethean Retrograde

Every new cycle of Mercury begins right after the symbolic New Mercury or Mercury’s inferior conjunction with the Sun, when Budha is closest to Earth. It starts with Mercury’s retrograde motion in the Promethean phase, where the mind is filled with raw potential, restlessness, intuition, and a desire to break free from old patterns.

Mercury, which is both Promethean and retrograde, seen in only about one out of ten birth charts, brings innovation through an initial struggle with the environment, and is often seen as if almost working against life itself – either against nature, or against existing social constructs. This type of Mercury is rebellious, seeking independence and liberation from biological limitations, inherited traditions, or the dictates of social convention. It seeks novelty and new ways of looking at things – but also eventually matures and becomes capable of deeper creative contribution.

Promethean Direct

After a stormy retrograde period in the Promethean phase, Mercury then first stations and then stabilises in its direct motion. It is still more on the innovative, outward-moving, or rebellious side, but already more grounded, with significantly less struggle with the environment or its limitations.

This Mercury type is intuitive, energetic, future-oriented, and generally more able than the Promethean Retrograde type to express ideas effectively in the social and practical world. People born under this phase often have persuasive communication skills, a strong vision of the future, and the ability to inspire others or turn ideas into large-scale action.

Epimethean Direct

After the superior conjunction with the Sun (Mercury and Sun on the same degree, while Mercury moves direct in its fastest motion), Mercury turns from Promethean (behind the Sun or the “forethought”) to Epimethean (after the Sun or the “afterthought”), where it is no longer oriented toward the future or a new discovery, but turns inward toward reflection on past experiences and focuses more on making knowledge grounded in reality.

Unlike the eager, intuitive Promethean type, Epimethean Direct Mercury tends to think through facts, past experience, patterns, and consequences before acting. People born under this phase often have practical, analytical, organized mental faculties, making them capable managers, teachers, theorists, and custodians of tradition or long-range vision. Their strength lies in careful deliberation, calculated risk, and the ability to place ideas within a larger historical or philosophical context, though they may need to guard against rigidity.

Epimethean Retrograde

As the cycle moves toward the end, Epimethean Mercury gradually slows down and stations, and finally becomes retrograde. This part of Mercury’s cycle is the shortest and therefore the rarest of the four Mercury types – heading toward the beginning of a new cycle or a charged threshold between frustration with the old and the dawn of new discovery.

This phase represents a deeply introspective, philosophical, and questioning mind that seeks inner meaning rather than accepting second-hand knowledge, authority, or social, religious, and scientific assumptions at face value. People born under this Mercury type often examine issues from every angle, searching for the deeper reason, purpose, and pattern behind events. Their insights may seem intuitive, but they usually arise from reflection, historical awareness, and an understanding of how the past can lead into a creative future. At times, this type may feel frustrated with the status quo or with others’ resistance to their ideas, but its gift lies in inner illumination, depth of thought, and the ability to inspire others through personal philosophy and hard-won realization.

Which type of Mercury are you? How does it colour the significations of Mercury in your birth chart?