What a transit is
The natal chart is fixed. The sky is not. Planets continue to move after birth, and when a moving planet forms a significant angle — a conjunction (0°), opposition (180°), square (90°), trine (120°), or sextile (60°) — to a planet or angle in the natal chart, that contact is called a transit.
A transit is a geometric relationship between two real points in the sky: one moving, one fixed. When Saturn in today's sky reaches 15° of Pisces and a natal planet sits at 15° of Virgo, Saturn is transiting that natal planet by opposition. The tradition reads that geometry as timing: a quality of season, a type of weather, a condition under which certain kinds of events and inner shifts become available.
Every planet transits constantly. The difference is speed — and speed determines scale.
Speed and scale
The Moon transits every natal point in a chart within about a month. It is the fastest-moving body in standard practice, covering roughly 12° per day. Moon transits describe daily texture: mood shifts, small openings and closures, the pulse of ordinary time. They are not turning points.
The Sun transits all twelve signs once per year. Solar transits to natal planets recur annually and mark consistent seasonal rhythms — the same natal point is activated by the Sun each year within a few days of the same date.
Mars completes a zodiac circuit in roughly two years. A Mars transit to a sensitive natal point brings urgency, effort, or friction — temporary and specific, lasting days to a week at most.
Jupiter and Saturn move slowly enough to define medium-term climate. Jupiter takes twelve years to circle the zodiac; a Jupiter transit to a natal planet lasts weeks to months and recurs on a twelve-year cycle. Saturn takes twenty-nine years; its transits are among the most structurally significant in standard predictive practice. Both are slow enough to define a season of life, not just a week.
Uranus, Neptune, and Pluto move so slowly — eighty-four, one hundred sixty-five, and two hundred forty-eight years respectively — that their transits to natal points are generational-scale events. A Pluto transit to the natal Sun may occur once in a lifetime, or not at all, depending on the natal degree.
The rule for reading time: work from the outside in. The outermost planets set the broadest frame. Jupiter and Saturn define the medium-term weather. The faster bodies add texture to what the slow ones are building.
Reading a transit
To read a transit, locate the degree the moving planet occupies today and compare it against the natal chart. Note which natal planet or angle it is aspecting, the type of aspect, and the orb (how many degrees it is from exact). A transit within one degree of exact is active and present. A transit three to five degrees approaching is building. A transit past exact by several degrees has peaked and is fading.
The duration depends on the planet's speed. A Mercury transit to a natal point lasts a day or two. A Jupiter transit lasts weeks. A Saturn transit — especially when the planet slows near a station — can be exact multiple times over several months as it moves forward, turns retrograde, and then returns to direct motion across the same degree.
The natal promise comes first
A transit does not create something out of nothing. It activates what the natal chart already contains.
If the natal Sun is in a strong position by sign and house, a Saturn transit to it is demanding — requiring effort, discipline, and accountability — but from a position of resource. If the natal Sun is already under stress from multiple natal aspects, the same Saturn transit is more pressuring. The transit does not determine the outcome. It describes the conditions under which the natal themes are being activated, tested, or developed.
This is why reading the natal chart carefully is not a preliminary step before timing — it is the foundation of every transit interpretation. The transiting planet does not arrive as an outside event. It meets what is already there.
Timing in astrology is not prediction in the sense of certainty. It is seasonal awareness: knowing which themes are being emphasized, which structures are under pressure, and which areas of life are most active in a given period. That awareness changes what can be noticed. What is noticed changes what can be acted on.