
Damnata
@Damnata
16 Years25,000+ PostsVirgo
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Mercury has four types based on its cycle and motion: Promethean or Epimethean, each possibly retrograde or direct. Your Mercury type influences your communication style and mental approach. To determine your Mercury face, find Mercury's position relative to the Sun in your birth chart or ephemeris, noting if it is ahead or behind the Sun and whether it is retrograde.









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Mercury turns direct nine to fifteen days after the inferior conjunction, and about a week later Mercury reaches its greatest distance from the Sun. A few days later, Mercury begins moving through the zodiac quicker than the Sun (or more than one degree a day). The superior conjunction occurs when Mercury is at the far side of the Sun, and while moving close to its maximum speed of about 2º15’ a day. It is analogous to the Full Moon and marks the beginning of Mercury’s waning hemicycle, during which Mercury sets in the early evening after the Sun. Rudhyar termed the waning Mercurial hemicycle Epimethean, for the always backward-looking brother of the forward-looking Prometheus. About four to five days after the superior conjunction, Mercury’s daily motion matches the Sun’s, and about two weeks later it turns retrograde. Then, ten to fifteen days after turning retrograde, the cycle closes with the inferior conjunction.
The Four Faces of Mercury
The brief look at the Mercury cycle presented above provides the foundation for the four-fold classification of Mercury types: Promethean-Retrograde, Promethean-Direct, Epimethean-Retrograde and Epimethean-Direct. They are Mercury’s four "faces," each representing a particular mental temperament.
It’s easy to determine your Mercury type. First locate the Sun in your birth chart. If Mercury is clockwise from the Sun, it is Promethean. On the other hand, if Mercury is counterclockwise from the Sun, your Mercury type is Epimethean. If you’re simply looking-up someone’s data in an ephemeris, notice if Mercury is ahead or behind the Sun in the zodiac. If the Sun is further along the zodiac than Mercury, then Mercury is Promethean. If Mercury is further along the zodiac than the Sun, then Mercury is in its Epimethean phase. While you’re at it, check to see if Mercury is retrograde (indicated by the character Rx in Mercury’s column above the date row). For example, if Sun is ten degrees Leo and Mercury is two degrees Leo, retrograde, then Mercury is Promethean-Retrograde. In a horoscope, retrograde planets are indicated by the Rx symbol.
http://www.khaldea.com/planets/merc_type.shtml