Lunar node
North Node in astrology
The North Node is not an object. It is the point where the Moon's orbit crosses the plane of the Earth's orbit going north, and it matters astronomically because eclipses can only happen when a new or full Moon lands near it. Astrologically it is read as the direction of growth: the sign and house describe territory you have no instinct for and are nonetheless pulled toward.
How old this reading is
Hellenistic for the astronomy, mid twentieth century for the modern "life purpose" reading
Also called: Rahu, Dragon's Head, True Node.
North Node at a glance
| What it is | An intersection of two orbital planes, not a body |
|---|---|
| Cycle | About 18.6 years |
| Time in a sign | About 18 months |
| Retrograde | Almost always. Direct motion is brief and rare |
| Opposite | The South Node, always exactly 180 degrees away |
| Governs | Direction, growth, the unfamiliar, what is being moved toward |
Not objects. The two places where the Moon's orbit crosses the plane of the Earth's orbit, which is why eclipses happen near them and nowhere else.
What the North Node means in a birth chart
The modern reading is that the North Node describes what you are here to develop, and the South Node what you already have. Whether or not you accept the reincarnation framing that produced it, the observation underneath is usable: the North Node sign tends to describe behaviour that feels effortful and slightly unnatural, and that people report as rewarding once they persist with it.
It is worth being clear that this reading is modern. The nodes are ancient and the astronomy is exact, but the "life purpose" interpretation belongs to the twentieth century, largely through Dane Rudhyar and Martin Schulman. Traditional astrology used the nodes very differently, mostly as an amplifier: the North Node increases whatever it touches and the South Node diminishes it.
True node or mean node
There are two versions in circulation and they can differ by more than a degree. The mean node is the smoothed average position; the true node is the actual osculating position, which wobbles and occasionally turns direct for a few days.
This site uses the true node, which is what Astrodienst and most modern software default to. Near a sign boundary the two can disagree about which sign you have, so if another site gives you a different North Node sign, this is almost always why.
Why it moves backwards
The nodes travel through the zodiac in reverse, taking about 18.6 years to complete a circuit and roughly eighteen months in each sign. That backwards motion is real rather than apparent, unlike planetary retrogrades: the Moon's orbital plane genuinely precesses westward.
The eighteen month period is also the reason your nodal return falls at about 18 or 19, then 37, then 56. Those ages appear in a lot of modern astrological writing about turning points, and the arithmetic behind them at least is not in dispute.
Frequently asked questions
- Is the North Node the same as Rahu?
- The same point, read very differently. Vedic astrology treats Rahu as a shadow planet with a strong and often difficult character of its own. Western modern astrology treats the North Node as a direction of growth rather than an agent.
- Why is my North Node always retrograde?
- Because the Moon's orbital plane really does drift westward. The true node occasionally turns direct for a few days, which is why some charts show it without the retrograde mark.
Where is your North Node?
None of this describes you until you know where your North Node actually sits. Every chart on this site now includes it, calculated from the Swiss Ephemeris alongside the ten planets.
Calculate my birth chart