Learn · The Sun, Moon and eight planets
Mercury
Mercury in a birth chart is the mind and the voice: how you think, learn, speak, text and connect. It stays close to the Sun, so it stands in your Sun sign or a neighbour.
You have already drafted the reply in your head, thought better of it, and written a better one. Mercury is that quick second draft: the way you take something in, weigh it and put it back into words.
In your chart
The sign sets the style of the mind: brisk in Gemini, exact in Virgo, imagistic in Pisces, blunt in Aries. Wherever it stands by house, most of your thinking and talking gets done there. Aspects show what the mind is wired to. A trine to Jupiter learns broadly and speaks with confidence; a square to Mars is quick and combative, and learns to argue well.
From a real analysis
In her chart: Mercury in Gemini, in the 8th house · 6°14′ Gemini
“Let me just say it out loud and see if it’s true.” That is how you think: the idea arrives half-built, and you finish it mid-sentence, in front of whoever is listening. Your Mercury, the planet of thinking and talking, sits in Gemini, the sign it rules, and the messenger of the old gods was always pictured with wings on his sandals, moving fastest in a sign that belongs to him. Your mind is at home here. You pick up a new subject by asking a second question before the first answer is done, and you explain it back so plainly that people ask you to explain it again to someone else.
Themes
Mercury is language, learning, curiosity, wit and the hands that write and type. It is also the ordinary business of a day: the errand, the message, the schedule. A strong Mercury cannot resist explaining, or asking, or pointing out the connection nobody saw. The restlessness is not shallowness: the quickness that skims a page also sees where it goes wrong, and Mercury is the one who finds the loose thread and asks the question that reopens a settled plan.
Overwork is the price. Mercury with nothing to do becomes worry with a good vocabulary, and the cure is a task: a list, a walk, a page written and put away.
Never far from the Sun
Mercury orbits the Sun in 88 days, and seen from Earth it never strays beyond about 28° from it, so a chart’s Mercury stands in the Sun’s sign or the one either side. Three or four times a year it turns retrograde, and about one chart in five has it so at birth; the tradition reads that as a mind that works inwardly first and speaks second.
Gemini and Virgo are its signs, and Virgo, at 15°, is also its exaltation, the one place where it is at home twice over. The tradition’s list of joys gives it the first house, so a Mercury near the Ascendant shows itself quickly.
How the analysis treats it
Mercury’s chapter records sign, degree, house, every aspect and whether it was retrograde. Together they are read as how you think and say things: what you notice, how you explain it, and to whom.
Your chart places Mercury to the minute of its sign, and the analysis names it by its degree, its sign and its house. When it was retrograde at the moment of birth, the chart marks it with an R.
Sources: every position and date here comes from NASA JPL’s DE440 ephemeris and is checked against NASA’s JPL Horizons. How it is checked.
Your Mercury
That is Mercury in everyone’s chart. Yours stands in one sign and one house, and those two say what it means for you. Free, and it takes a minute.