The South Node is not a planet or a star: it is one of the two points where the Moon’s orbit crosses the apparent path of the Sun. There is nothing there for a telescope to point at. It is geometry, and it is geometry that matters, because those two points are exactly where eclipses happen.

The two points always come together, 180 degrees apart, because they are the two ends of the same line. The upper one is called the North Node; the lower one, the South Node. They are not two independent points that happen to oppose each other: they are one thing, seen from two ends. That is why your South Node does not need to be calculated separately, if you know where your North Node is, you know where the South is.

The South Node is in the sign opposite your North Node, always. Not by interpretation: by definition. The whole round comes below, find your South Node, and the link takes you to the page for the pair.

South Node in Aries goes with North Node in Libra; South Node in Taurus, with North Node in Scorpio; South Node in Gemini, with North Node in Sagittarius; South Node in Cancer, with North Node in Capricorn; South Node in Leo, with North Node in Aquarius; South Node in Virgo, with North Node in Pisces; South Node in Libra, with North Node in Aries; South Node in Scorpio, with North Node in Taurus; South Node in Sagittarius, with North Node in Gemini; South Node in Capricorn, with North Node in Cancer; South Node in Aquarius, with North Node in Leo; and South Node in Pisces, with North Node in Virgo.

If you know neither, the free chart shows both points with sign and degree, in under a minute.

The South Node is what you already know how to do. The ready-made skill, the familiar road, the place you run to when things get tight. It is real competence, and it is precisely because it is real that it charges you: it works so well that you stop trying anything else.

The cost appears when the skill becomes a reflex. You do it before considering whether it is what you want to do, and one day you notice you have built an entire life around the easiest answer. The bill arrives as tiredness with no cause, almost always late.

And here is the most repeated mistake about this point, the one in almost every text about the nodes: the South Node is not a punishment, and the task is not to abandon it. It could not be, it is your sharpest tool. The task is to use it in service of the North Node, rather than in its place. Whoever drops the South does not advance to the North: they end up with neither.

We measured every passage of the South Node through the twelve signs between 1900 and 2030, every six hours: 83 whole passages, and the average is 566.2 days, 18.6 months. The shortest lasted 535.8 days and the longest 633.3.

That number has a partner that explains it. The node pair takes 18.61 years to go all the way round, and a cycle of 18.61 years gives 18.6 months in each sign, it is the same division by twelve, not a pretty coincidence. 18.6 years for the round, 18.6 months for each sign.

The practical consequence is the one that matters most on this page: the sign of your South Node belongs to everyone born in the same year-and-a-half stretch as you. It is not personal. What individualises it is the house it fell in, and the house depends on the exact time of birth, which is why there is a whole series about the pair in the twelve houses.

The nodes move backwards almost all the time, but not always. On about 26% of days the true node moves forwards, and near a cusp that produces something almost no text mentions: the South Node leaves a sign, enters the neighbouring one and returns.

Measured across the same 130 years, this happened 6 times, adding up to 87 days:

From 23 to 31 August 1922, for 8.5 days, between Aries and Pisces; from 3 December 1945 to 3 January 1946, for 31.8 days, between Capricorn and Sagittarius; from 5 to 13 January 1980, for 7.3 days, between Pisces and Aquarius; from 20 to 24 September 1981, for 3.8 days, between Aquarius and Capricorn; from 6 April to 9 May 1986, for 32.5 days, between Scorpio and Libra; and from 15 to 18 December 2007, for 3.3 days, between Virgo and Leo.

Anyone born inside one of those windows has a South Node that nobody born the week before or the week after has. It is few people, 87 days in 130 years, and it is why a table of dates copied from another site can get your sign wrong even while being right for the whole month. In those windows, only the exact date settles it.

Since the pair takes 18.61 years for the whole round, it takes half of that to travel 180 degrees. We measured the half-turn from seventeen different starting points between 1920 and 2000: 9.28 years on average, ranging from 9.17 to 9.40.

That means something concrete and checkable inside your own family: anyone born about nine years and four months before or after you has their North Node where you have your South. What is old skill to you is the new task to them, and the other way round. It is why two generations less than a decade apart tend to find incomprehensible exactly what the other does effortlessly.

There are two ways of calculating the nodes, and they disagree. The true node is the direction of the crossing at that instant; the mean node is a smoothed average, without the Moon’s jolts. The two sit 0.96 degrees apart on average, and fall in different signs on 3.3% of dates, one chart in thirty.

This site uses the true node. If you have ever seen two sites disagree about your South Node, that is why, and neither of them is wrong.

Since the whole round takes 18.61 years, the pair returns to its birth position at around 18 and a half, 37, and 55 and a half, and, for those who get there, 74. Those are the ages at which the conversation between what you already know and what you have not yet learned tends to get loud.

It is not a prediction of events. It is the clock of a subject: the nodal return marks when the question comes back, not what it answers. Many people recognise those ages as the ones in which they dropped something they did far too well in order to start something they did badly, and that is exactly the shape of the movement from South to North.

The sign belongs to your year-and-a-half cohort; the house does not. The house depends on the time of birth, and changes roughly every two hours, two babies born the same day, in the same city, four hours apart, have the same pair in the same sign and in different houses.

It is the house that says where the old skill repeats itself: in conversation, in daily work, in the parents’ home, in a relationship of two. Since the South is always 180 degrees from the North, and opposite houses are too, the South Node always falls in the house opposite the North Node’s, North in house 1, South in 7; North in 4, South in 10. The series that walks all twelve begins at the pair in house 1.

Recognising the South Node in your week does not come from the description of the sign, it comes from the pattern. There are three signals, and they hold for any South Node:

• It is what you do when you are in a hurry. Under pressure nobody experiments: everybody repeats what works. What comes out automatically in an emergency is almost always the South’s skill.
• It is the compliment you are tired of hearing. The quality people have pointed out in you since childhood, and which you receive with mild boredom, usually comes from there.
• It is the way out that solves without satisfying. You do it, it works, and even so you are left feeling you escaped something rather than made it.

If all three point to the same place, you have found your South without needing any table.

The South Node does not say what you were in a past life. Reading past lives is a respectable tradition and it is a choice of interpretation, not a fact of the calculation, what the chart provides is the geometry, and the rest is reading. It is worth knowing the difference before treating one as the other.

Nor does it say you should stop doing that thing. And it says nothing on its own: one point of the chart read outside the whole becomes a magazine horoscope. The South Node in Cancer of someone with the Moon in Capricorn and that of someone with the Moon in Pisces describe the same skill and two people who are nothing alike.

And the questions that come up most on this subject, with the short answer: