Mercury
personal · cycle 88 days · retrograde every 116 days
Dignities
Hellenistic tradition
Mercury rules Gemini (diurnal) and Virgo (nocturnal). Exalted and ruling in Virgo, a rare double dignity.
Modern Western reading
Modern Western astrology reads Mercury as the principle of language, exchange, and analytical structuring.
Questions
- How long does Mercury take to go through the zodiac?
- About 88.0 days for one full circuit as seen from Earth. That is the synodic figure this site computes ephemeris positions against, not a sidereal orbital period, and it is what determines how long Mercury stays in one sign: roughly one twelfth of the cycle, stretched or compressed by retrograde motion and by the eccentricity of the orbit.
- Which signs does Mercury rule?
- Mercury rules Gemini and Virgo. It is exalted in Virgo. It is in fall in Pisces. It is in detriment in Sagittarius and Pisces. Rulership is a fixed correspondence, so it holds in every chart; what changes chart to chart is whether Mercury actually occupies one of those signs.
- Is Mercury a personal planet?
- Mercury is classified here as a personal. Personal planets move fast enough to differ between people born the same month, which is what makes them readable at the individual level.
- How often is Mercury retrograde?
- Mercury turns retrograde roughly every 116 days. Retrograde motion is apparent, not real: the planet keeps moving forward, but seen from a moving Earth its longitude decreases for a stretch. Because the effect depends on the geometry between two orbits, the interval and the duration both vary between cycles, so a stated average will not match any single retrograde exactly. Live station dates are computed rather than tabulated on this site.
Reference, not advice
This is cultural and astronomical reference, not personal prediction or advice.
Cycle periods are mean orbital values. Traditional interpretations paraphrased from primary classical and modern sources. See sources.
Last reviewed .