What is a transit?

A transit happens when a planet moving through the sky right now forms an angle with a fixed point in your birth chart. Slow planets such as Saturn and Pluto mark out cycles measured in years. Fast ones such as the Moon and Mercury come and go in a day or two. Moon Shine AI crosses the current sky with your own chart, so you can see which of your points is being touched today.

March 2023, one real example

Saturn left Aquarius in March 2023 and moved into Pisces. For someone with Virgo rising, which puts Pisces on the cusp of house 7, that meant Saturn walking straight into the house of partnership. Two years into a relationship at the time, this person decided to make it official. Nothing about it went quickly. The wedding date was pushed back three times, the flat hunt dragged on far longer than planned, and money turned into a sore subject with both families.

That is a fairly typical shape for Saturn in the seventh. Not an easy yes, more a yes that gets tested. The relationship goes through a kind of examination, and what gets measured is whether both people will back the commitment with actions instead of statements. Saturn spends roughly two and a half years in one sign, so the transit ran long. Retrograde motion carried it back over the same degrees of Pisces more than once, and each return put the same question back on the table.

Meanwhile the same ingress passed almost unnoticed for plenty of other people. Where that sign sits in a different chart, on an empty stretch with nothing natal in it, Saturn crosses without much to show. The sky is identical for everyone on a given date. What differs is the chart underneath, frozen at each person's moment of birth.

Two layers of time running at once

Your birth chart is a record of one instant and it never updates. A transit shows where each planet is today, while you are reading this. Saturn changed signs on the same calendar day for the entire planet, which is exactly where the nuance hides. In one chart that sign covers house 7. In another it covers house 3. In a third it touches nothing that carries any weight.

So "there is a big transit in the sky today" says very little by itself. The useful question is which house and which natal planet that transit is landing on in your particular chart. Transiting Mercury changes sign every few days while your natal Mercury stays put forever. Both are real, both are being reported, and reading them as one thing is where most confusion starts.

Fast planet, slow planet, very different clocks

The Moon changes sign roughly every two and a half days. Mercury and Venus hop from one sign to the next every few weeks. A Moon transit points at the mood of a single day. A Mercury transit points at a communication theme lasting a couple of weeks. They arrive, they do their thing, and they leave without much residue.

Saturn is another matter entirely, sitting in one sign for close to two and a half years. Pluto can occupy a single sign for twenty years, which puts it on an entirely different scale. The person in the example above felt Saturn finally clear house 7 in early 2026, by which point the wedding had happened and the flat had been found. Slow planets describe a chapter of a life rather than an incident in it.

For "how am I doing today" the Moon and Mercury are enough. For the source of a shift that has been building all year, look at Saturn, Uranus, Neptune and Pluto. Mix up the two scales and a passing mood gets read as a permanent turn, which is where people usually lose the thread.

Orb, aspect type and why some transits land harder

Orb is the margin in degrees allowed between the transiting planet and the natal point for the aspect to still count as active. With slow planets the working orb usually runs between 1 and 3 degrees. That narrow window explains the shape of the experience. Something registers weeks before exactness, peaks when the aspect is exact, then fades out gradually. In the Saturn example the first friction around the partnership showed up well before the planet had fully settled onto the angle.

Aspect type matters too. Conjunctions and squares tend to feel sharper. Trines and sextiles run smoother and often read as an opening that appears without much effort. An opposition brings the sensation of standing face to face with a person or a situation you cannot walk around. House 7 already carries relationship material, so a conjunction there turned the whole period into a question about who and on what terms.

Existing natal tension raises the volume. If that axis already held a difficult aspect at birth, a transit crossing it hits harder and lasts longer in memory. An empty degree usually lets the same transit pass with barely a sound.