Direct answer
Short version
A transit lasts as long as the moving planet stays within orb of the natal point. A Moon transit can be over inside a day, a Sun or Mercury contact runs a few days, Jupiter takes weeks, and Saturn, Uranus, Neptune and Pluto can hold a contact for months and return to it two or three times when they station. The exact moment is when the angle is exact, and it is a moment, not a season.
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How Long Does a Transit Last, and When Is It Exact
What actually sets the length
Two numbers, and nothing else. The first is the orb you allow: how many degrees either side of exact you agree to call contact. The second is the moving body’s daily motion. The Moon covers about thirteen degrees a day, so a three degree orb is roughly eleven hours from edge to edge. Saturn covers a small fraction of a degree in a day and stands almost still near a station, so the same three degrees can hold for months. The meaning you read into a transit does not change that arithmetic. The window is geometry, and it can be solved rather than estimated.
Applying and separating are not the same weight
A transit that is closing on exact is described in the tradition as applying, and one that has passed exact is separating. The distinction is older than the psychology usually attached to it: an applying contact is still gathering, and a separating one is spending what it already gathered. In practice this is why the days before exact often feel like pressure and the days after often feel like consequence. Neither half is a forecast. What the geometry gives you is an order of events, not a description of what those events will be.
Why the same transit can happen three times
When an outer planet turns retrograde while inside the orb of a natal point, it crosses the same angle on the way back and again when it turns direct. The result is three passes across a year or more, and the tradition reads them as one continuous matter rather than three separate ones: something is raised, revisited, and settled. The middle pass, taken while the planet is retrograde, is usually the one that asks the question the first pass only implied. Reading the three as unrelated events is the most common way a long transit is misread.
What the window cannot tell you
It cannot tell you what will happen, and it cannot tell you that anything will. A measured window says when a geometric relationship holds between two points, with a beginning, an exactitude and an end. It says nothing about whether you will notice, whether the matter is welcome, or what you should do. Two people under the same transit can have entirely different years, because the transit is one factor beside health, work, other people, preparation and choice. Precision about the sky is not the same as knowledge about a life.
Concrete examples
| Example | What it means in practice |
|---|---|
| Moon square natal Mars | In and out inside a day. Useful as a note about mood, useless as a plan. |
| Jupiter trine natal Venus | A few weeks either side of exact. Wide enough to put something on the calendar inside it. |
| Saturn conjunct natal Sun, three passes | One theme across a year or more, met three times. The middle pass usually asks the real question. |
Prayerful reflection
Let me meet what is actually here today rather than the shape I imagined a month ago, and let me not mistake a long season for a permanent one.
Related Almanac guides
More from the journal
Sources and editorial method
Research and editorial references used for this page include:
- Astrodienst: Transits - Used for the basic definition of transits as current planetary passages over birth positions.
- Astrodienst: The four Elements - Used for the traditional grouping of zodiac signs by element.
This guide distinguishes traditional symbolism from calculated positions. Examples illustrate possible reflections, not predictions about a particular person.
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Common questions
How wide should my orb be?
Most practitioners work between one and three degrees for timing and widen only with a stated reason. The number matters less than using the same one every time, so that your readings can be compared with each other.
Does a transit stop the moment it leaves orb?
Not cleanly. The edge of an orb is a convention rather than a wall. What the geometry gives exactly is the moment the angle is exact; either side of it is a gradient, and you have chosen where to cut it.
Why do slow transits feel like they last for years?
Because a slow planet can hold the same angle for months and return to it two or three times, and because the circumstances it coincides with rarely resolve on the day the orb closes. The contact is measurable; the aftermath is not itself a transit.
