Your birth chart is a snapshot. It captures the sky at a single moment and holds it still, but the sky did not stop moving when you were born. The planets continued their orbits, and they continue them now, passing through the same zodiac that your chart maps, forming angles to the positions they occupied at your birth. These ongoing planetary movements, measured against your natal chart, are called transits, and they are the primary mechanism through which astrology describes the unfolding of a life over time.
How Transits Work
At this moment, Saturn is at a specific degree of a specific sign. If that degree happens to be the same degree where your natal Moon sits, Saturn is transiting your Moon. The quality of the experience will carry Saturn's signature (limitation, responsibility, the demand to mature) applied to the Moon's domain (your emotional life, your sense of safety, your relationship to comfort and home).
The transit does not overrule your natal chart - your Moon is still in its birth sign, still in its birth house, still carrying every aspect it was born with. What the transit does is activate it, pressing on it the way a finger presses a key on a piano. The note that sounds is the natal placement and the finger that presses it is the transiting planet. The music that results comes from harmony of both.
Speed and Duration
The impact of a transit depends largely on how long the transiting planet stays in contact with the natal point. This is a function of planetary speed, and the differences are enormous.
The Moon transits every point in your chart roughly once a month, spending about two and a half days in each sign. Lunar transits color your mood for a few hours. You feel them, but they pass quickly, like weather.
The Sun transits each point once a year, spending about a month in each sign. Solar transits are more noticeable - the month when the Sun crosses your Ascendant often feels like a personal new year, a period of renewed vitality and visibility.
Mars takes about two years to complete the zodiac. A Mars transit to a natal planet lasts a few days to a week and often corresponds to a burst of energy, conflict, or decisive action in the area of life the natal planet governs.
Jupiter takes twelve years. A Jupiter transit lasts a few weeks and often brings expansion, opportunity, or a sense of things opening up. Saturn takes twenty-nine years. A Saturn transit can last several months due to retrograde motion, and its effects are among the most consequential in astrology - the periods of restructuring, loss, discipline, and eventual achievement that define the major chapters of a life.
The outer planets, Uranus, Neptune, Pluto, move so slowly that their transits to natal planets can last a year or more, and these are the transits that transform lives. Pluto transiting your Sun over the course of two years will dismantle and rebuild your sense of identity in ways you could not have predicted and cannot reverse.
The Major Transit Aspects
When a transiting planet makes a conjunction to a natal planet, the transit energy merges with the natal energy directly. This is the most intense form of transit.
When a transiting planet squares a natal planet, the transit creates friction and pressure that demands action or change.
When a transiting planet opposes a natal planet, the transit creates awareness of a tension, often through encounters with other people or external circumstances that force a confrontation with something you have been avoiding.
When a transiting planet trines a natal planet, the transit creates ease and flow in the area of life involved. Opportunities appear, things come together without excessive effort, and the natal planet's expression is supported.
Transiting sextiles offer opportunity that must be actively seized. Transiting quincunxes produce adjustments that feel confusing until they settle.
Transits to the Angles
Transits to the Ascendant, Midheaven, IC, and Descendant are among the most personally felt transits because the angles are the most sensitive structural points in the chart. Saturn crossing the Midheaven often coincides with a major career event - a promotion, a crisis, a redefinition of professional direction. Uranus crossing the Ascendant can coincide with a dramatic change in personal identity or physical appearance. These transits mark turning points.
How to Track Them
Most astrology software and apps will show you your current transits: which planets are where in the sky today, and which points in your natal chart they are activating. The most useful practice is to track the slow planets (Jupiter, Saturn, Uranus, Neptune, Pluto) and note which natal planets and houses they are transiting over the course of months and years. These are the transits that define the major movements of your life.
The daily and weekly readings on Voidwire are transit interpretations. When your reading says that Mars is activating your seventh house, it is describing a transit: Mars, at its current position in the sky, is passing through the section of the zodiac that falls in your seventh house. Understanding transits is understanding what the daily or weekly reading is actually telling you and why.