The lunar nodes, north and south

Nodes · two crossing points, not bodies · nodal cycle about 18.6 years · always exactly 180° apart

01Two crossings, not two objects

The Moon does not orbit Earth in the same plane the Earth orbits the Sun. Its path is tilted a few degrees against the ecliptic, the Sun's apparent yearly track, which means the Moon spends part of every month slightly above that plane and part of it slightly below. A lunar node is one of the two points where the Moon's tilted path crosses the ecliptic exactly — the ascending node, where the Moon crosses moving northward, and the descending node, where it crosses moving southward. There is no body at either point, only a geometric fact about where two planes intersect, which is why Lizastro treats the nodes the way it treats Lilith: as computed points rather than observed objects, placed on the wheel with a sign, a house and a degree, but with no mass and no orbit of their own around anything.

Because the two nodes are, by definition, the same intersection line seen from opposite sides, they sit exactly 180 degrees apart at all times, with no exception. The south node is not calculated independently — it is derived directly as the point diametrically opposite the north node, which is also why the engine only needs to track the north node's motion to know both positions at once. This also means an aspect between the north and south node is never reported: any two points fixed at exactly 180 degrees apart trivially form an opposition to each other on every chart, forever, which carries no information and is filtered out before a reading is ever produced.

The five-degree tilt is itself the reason the two crossing points exist at all. If the Moon's orbit sat perfectly flat against the ecliptic, there would be no crossing to mark — the two paths would simply coincide everywhere, and a new or full Moon would line up with the Sun's position in three dimensions every single month. The actual tilt is small enough that the Moon usually passes near the ecliptic without landing exactly on it, which is why the nodes matter specifically as the two narrow points where "near" becomes "exactly on."

02A slow point that mostly moves backward

The nodes complete a full lap of the zodiac in about 18.6 years, moving in the opposite direction to almost everything else in the chart — where the Sun, Moon and planets all advance forward through the signs, the mean node regresses steadily backward through them. That regression is caused by the Sun and Earth's gravity slowly dragging the tilt of the Moon's orbital plane around, the same kind of perturbation that gives Lilith its own, faster nine-year cycle, applied to a different piece of the Moon's orbital geometry.

At about 18.6 years to complete the circuit, the mean node covers roughly 19 degrees of zodiac a year, backward, which means it lingers in a single sign for around a year and a half before crossing into the previous one. That single fact changes what birth time actually matters for. The Sun's sign depends on the date; the Moon's sign can depend on the exact hour, because the Moon covers about 13 degrees a day. The node's sign depends on essentially nothing but the date, because it moves so slowly that an error of hours, or even most of a day, makes no difference to which sign it falls in — the only real timing sensitivity left is which house it occupies, not which sign.

That slowness also puts the nodes in the same category as Uranus, Neptune and Pluto in one respect, without actually being generational the way those three are: a node's sign is shared by everyone born within roughly the same year and a half, so on its own it says less about one person specifically than about the wider cohort born under it, and the more individual reading comes from the house the node falls in and what it aspects, exactly as it does for the slow outer planets. The direction is the opposite of the outer planets, though — they move forward through the zodiac at their own slow pace, while the nodes move backward, which is worth holding onto precisely because it is the one placement in an ordinary reading where "retrograde" describes the normal, expected state rather than an exception worth flagging.

03Mean and true, the same split Lilith has

Like Lilith, the nodes come in two calculated versions. The mean node is built from the smoothed, idealized version of the Moon's orbit and moves at that steady, predictable backward pace with no exceptions. The true node tracks the Moon's actual, perturbed path rather than the average of it, and because the real orbit wobbles, the true node does not move with perfect uniformity either — it drifts around the mean position, and for brief stretches it can even reverse its own regression and move forward before rejoining the general backward drift. That brief forward motion is the one moment the nodes behave like an ordinary direct-moving body, and it is also the reason "the nodes are always retrograde" is only true of the mean calculation, not a universal law of the true one.

Lizastro's interpreted default is the true node rather than the mean — the version that tracks the Moon's actual path — while the mean node is still computed and placed on the wheel for anyone who wants to compare the two, the same transparency Lilith gets. For most charts the difference between the two calculations is small enough not to matter; for a chart where it does matter, both are there to check rather than one being silently assumed.

04Why eclipses only happen here

An eclipse needs three bodies lined up in three dimensions, not two dimensions — the Sun, Earth and Moon have to sit close enough to a single line that one blocks the light of another, and because the Moon spends most of every month above or below the ecliptic plane, most new and full moons miss that alignment entirely, passing too far north or south of the Sun's apparent position for a shadow to connect. The only points where the Moon's path actually crosses the ecliptic plane are the two nodes, so an eclipse can only happen when a new or full Moon falls close enough to one of them for the three-dimensional alignment to actually work. That is the entire mechanism behind the pattern: eclipses cluster near the nodes not because the nodes cause anything, but because the nodes mark the only two places in the sky where the geometry required for an eclipse is even possible. A new Moon far from either node simply passes above or below the Sun as seen from Earth, no shadow involved at all, which is the ordinary outcome most months and the reason eclipses are the exception rather than a monthly event despite a new and full Moon happening every month without fail.

05What it is not

The nodes are not planets, and no natal reading should imply they carry a planet's kind of physical presence — they are pure geometry, a record of where two orbital planes intersect, and the strengths and cautions attached to them describe a direction of effort rather than a possession. The north node marks a direction that has to be chosen and practised deliberately, something unfamiliar rather than already comfortable; the south node marks what is already practised well enough to default to, including in the moments when defaulting to it is the easier choice rather than the better one.

What the nodes are not is a record of a past life, and this is worth naming directly because it is the overclaim the topic attracts more than almost any other placement in a chart. The idea that the south node describes who you already were and the north node describes a destiny you are obligated to grow toward is a narrative borrowed from outside the geometry and laid on top of it, and it turns a description of tendency into a claim about the reader's fate — exactly the move a chart built to show its arithmetic does not make. What the calculation actually supports is narrower and more useful: one direction that comes easily and one that has to be built on purpose, read as a tendency in this life, not a plot summary of a previous one.

06Where you see it in your own chart

Both the north and south node are shown on a Lizastro chart with their own sign, house and degree, computed as the true node by default with the mean node available alongside it — worth checking together in the rarer case where the two disagree by enough to matter. Because the node's sign barely depends on birth time at all, it is one of the more stable placements in a chart even where the exact hour of birth is uncertain, in sharp contrast to the Ascendant a few sections of this site over, which depends on almost nothing else.

→ Find your nodes · Read the full methodology

07Related reading

Lilith is the other computed-point pair in the chart, with the same mean-versus-true structure and the same commitment to showing both rather than picking one silently. Cancer, the sign the Moon itself rules, is worth reading alongside this piece, since the nodes are entirely a fact about the Moon's orbit rather than about any planet.

Updated 2026-07-29.