Which transits matter most?

The slow ones. Saturn, Uranus, Neptune and Pluto make contacts lasting months or years, which is long enough to observe. Fast bodies repeat too often to carry structural meaning.

How long does a Saturn transit last?

Saturn orbits in about twenty-nine and a half years, so it spends two to three years per sign and its aspects to a natal point run for months, often in three passes because of retrograde motion.

Are Moon transits worth reading?

The Moon returns to every point in your chart monthly, so its transits cannot mark anything rare. Most astrologers read them for mood within a day rather than for events.

What the sky is doing to your chart

Pick a window and you get every aspect within three degrees, with the date each one is exact.

Thin orbit arcs passing over a fixed chart wheel, one planet touching a marked point

How transits work

The same for every chart.

What you get

What you’ll need: Your birth date. Optional: your exact birth time and city.
What you’ll get: What the current sky is aspecting in your chart, and when each is exact.

What a transit is

Your birth chart does not move. The planets do, and a transit is simply one of them arriving at an angle to something in your chart. That is the whole idea, and it is the part of astrology most practitioners spend most of their time on.

How to read a list like this

The date shown is when the aspect is exact, not when something happens. A Moon transit lasts hours; a Jupiter one can stand for weeks either side. Nothing here predicts an event, and a heavy-looking week is not a warning. Astrologers offer a description of a texture, and the way to use it is to notice afterwards whether the texture matched, which is a question you can only answer for yourself.

Which transits to pay attention to

Everything in the sky is transiting something in your chart at every moment, which means a list of transits with no filter is noise. What separates a transit people bother reading from one they ignore is how long it lasts, and that comes straight from orbital period.

Saturn takes about twenty-nine and a half years to go round, so it spends two to three years in a sign and its contacts to a natal point last months. Uranus takes eighty-four, Neptune about a hundred and sixty-five, Pluto about two hundred and forty-eight and moves so unevenly that it can sit on one degree for years. Those are the ones astrologers write books about, because a transit that lasts a season is something you can notice; there is time to see whether the reading fits.

At the other end, the Moon crosses the whole zodiac in under twenty-eight days and changes sign every two and a half. Any natal point it touches, it touches again next month. Reading the Moon's transits for life events produces a hit every few days and means nothing, and most working astrologers use it for mood and timing within a day rather than for anything structural.

That gives you a plain rule for the list on this page: the slower the body, the more weight the contact carries, and the fast ones are best read as texture on top of it.

What this calculation assumes

version: asternym-transits-v1
orb: 3° for every aspect, with no widening for the Sun or Moon
aspects: The five major aspects: conjunction, opposition, trine, square, sextile
targets: Your natal Sun and Venus always; your natal Moon, Ascendant and Midheaven only when you have given an exact birth time
sampling: Positions taken at noon UTC on each day of the range
returns: A body aspecting its own natal position is skipped, since the Sun and Moon meet their own degrees constantly
padding: Nothing is padded. An empty window means nothing was within orb