Astrology transits are the positions of the planets right now, read against the fixed positions they held at the moment you were born. When a moving planet forms an exact angle to a point in your birth chart, astrologers call that a transit, and every serious forecast is built from them.

Here is the image I give every new student. Your birth chart is a clock face painted at the instant you arrived: the planets frozen mid-stride, fixed forever at their marks. The sky never stopped moving, though. Transits are the live hands sweeping around that painted face, and the entire forecasting tradition, from newspaper columns to everything in the astrology hub, is the craft of reading where the hands stand against your painted numbers. It is most of what I do all day, and my own practice notes live on my page.
What Exactly Is a Transit?
A transit is the moment a planet's current position forms a meaningful angle to a position in your birth chart. Nothing mystical hides in the mechanics: planetary positions are published in an ephemeris, the same tables astronomers use, and any two astrologers will agree to the arc-minute about where Saturn stands today. The positions are astronomy; the interpretation is the art. This is also why the same week treats two people so differently. Saturn crossing fifteen degrees of Leo is a shrug to a chart with nothing there and a landmark to a chart holding the Sun on that exact degree. The sky is shared. The clock face it strikes against is yours alone. There is a second dial as well: whichever of the twelve houses the moving planet is passing through in your chart names the arena, money, marriage, work, health, where its business gets conducted. The aspect describes the pressure; the house is the address it gets delivered to.
Why Do Fast and Slow Planets Feel So Different?
Speed decides weight. The Moon laps your entire chart every 27.3 days, so lunar transits last hours and color a mood, nothing more. The Sun, Mercury, and Venus each cross a sign in weeks, and Mars takes six or seven; these are the errands and irritations of a season. The slow bodies write the chapters. Jupiter spends about a year in each sign. Saturn spends about two and a half, which is why a Saturn return arrives just before age thirty and lands like a life audit. Uranus takes roughly seven years per sign, Neptune about fourteen, and Pluto, riding a stretched elliptical orbit, anywhere from twelve to thirty one, which is why Pluto's move into Aquarius is a generational event rather than a personal errand. This is also why an astrologer hearing about your rough week will ask for exact dates before offering a cause. The speed of the planet involved is diagnostic: a mood that lifted by Thursday was never Saturn.

What Are Orbs and Aspects?
An aspect is the angle a transiting planet makes to a natal point, and an orb is the tolerance around exactness that still counts. The working aspects are the conjunction at 0 degrees, the sextile at 60, the square at 90, the trine at 120, and the opposition at 180. For transits, most practitioners keep orbs tight, one to three degrees, because a transit behaves like an event with a build, a peak, and a fade. An applying transit, still closing on exact, tends to feel like pressure gathering; a separating one, like pressure draining. When a client tells me the crisis already broke last Tuesday, the ephemeris usually shows the aspect went exact last Tuesday. The clock keeps better time than memory does.
Why Do Some Transits Hit Three Times?
Because of retrograde motion, a slow planet often crosses the same degree three times: forward, backward, forward again. The backward leg is apparent rather than real. Earth overtakes the slower planet, the way a car you pass on the highway seems to slide backward, and for a while the planet appears to reverse along the zodiac. Forecasting treats those three exact passes as one story in three acts: the matter introduced, the matter reviewed, the matter resolved. It is why a Saturn lesson can feel like an exam, a resit, and a final. Working astrologers mark all three dates for clients, and I flag the middle pass especially, because the retrograde crossing is usually when the matter turns inward, a review conducted with the door closed. The same loop is what makes Mercury retrograde a season rather than a day.
How Do Astrologers Turn Astrology Transits Into a Forecast?
They compute every date in the coming year when a moving planet strikes an exact aspect to your chart, then weight the list by planet speed and by what it touches. A Pluto contact to your natal Sun outranks a Venus contact to an empty degree by an order of magnitude. Cluster the heavy dates and you have the year's windows. That arithmetic is exactly what a written forecast report is; the twelve month version on my readings page computes it for one chart at a time. The free route to the same literacy is learning to read your own natal chart, so the transit tables mean something when you meet them. And before you spend on any report, if you are curious how much of this sky-watching you already do by instinct, the seeker quiz gives you a free two-minute answer. If one question is burning rather than a whole year, ten focused minutes with an astrologer, arranged the way the live psychic chat guide describes, beats buying a report you only need one page of.

Do transits affect everyone the same way?
No. A transit only registers where your chart has furniture. Astrologers rank contacts to the Sun, the Moon, the chart ruler, and the four angles as the heavyweights; the same Saturn pass that dismantles one person's career house glides silently through another's empty third.
What is the difference between a transit and a progression?
A transit is the real sky touching your chart in real time. A progression is symbolic: in the common day-for-a-year method, the sky on your thirtieth day of life stands in for your thirtieth year. Forecast work usually weaves both together, but the transits are what carry the dates.
How long does one Pluto transit last?
Counting the retrograde passes, a single Pluto aspect can stay live for eighteen months to three years. Plenty of people go a whole lifetime without Pluto ever touching an inner planet, which is its own kind of luck, though they rarely know to be grateful for it.
None of this is prophecy. A transit is only the real sky standing at a measurable angle to the chart you were born under, and every forecast worth the name is arithmetic performed on those angles. The planets keep their schedule whether or not anyone is reading it, and it is the slow hands, the ones that need years to cross a single degree, that end up writing the parts of a life a person actually remembers.