No. 20 · Free
North Node calculator: what is my North Node?
Your North Node is the point where the Moon's orbit crossed the ecliptic going north at the time of your birth; the South Node sits exactly opposite. Astrology reads the axis as a line from what comes easily to what you are here to grow into. The node spends about eighteen months in a sign, so your birth date settles it; a birth time adds the house.
Enter your birth date and birthplace, and the time if you know it. The calculator gives the true North Node, the South Node opposite it and the mean node for comparison, with the house when you give the time.
Your North Node (true node)
The lunar nodes are the two crossings of the Moon's path over the Sun's, read as the axis between habit and growth.
The record
Enter your birth date and place, then press the button. You get the North Node's sign and degree, the South Node, the mean node, the dates the node held that sign and, with a birth time, its house.
Accuracy: the mean node agrees with the Swiss Ephemeris to within a second of arc; the true node, computed from the Moon's orbit in the Meeus lunar theory, to within one arcminute (1900 to 2099).
Want every planet at once? Open the full birth chart calculator
The North Node in each sign, in short
North Node in Aries
Growth lies in acting for yourself and taking the first step; the South Node in Libra leans on keeping others happy.
North Node in Taurus
Growth lies in building your own security and slowing down; the South Node in Scorpio knows crisis too well.
North Node in Gemini
Growth lies in curiosity, questions and everyday conversation; the South Node in Sagittarius is sure it already knows.
North Node in Cancer
Growth lies in home, family and letting yourself need people; the South Node in Capricorn hides behind duty.
North Node in Leo
Growth lies in creating and being seen as yourself; the South Node in Aquarius blends into the group.
North Node in Virgo
Growth lies in practical work, routine and service; the South Node in Pisces drifts toward escape.
North Node in Libra
Growth lies in partnership, compromise and real listening; the South Node in Aries goes it alone.
North Node in Scorpio
Growth lies in depth, shared resources and letting go; the South Node in Taurus clings to comfort.
North Node in Sagittarius
Growth lies in meaning, travel and the bigger view; the South Node in Gemini gets lost in details.
North Node in Capricorn
Growth lies in responsibility and a goal of your own; the South Node in Cancer stays in the nest.
North Node in Aquarius
Growth lies in friendship, causes and the future; the South Node in Leo waits for applause.
North Node in Pisces
Growth lies in faith, rest and trusting the flow; the South Node in Virgo tries to control every detail.
§ 01
What the lunar nodes are
The Moon's orbit is tilted by about five degrees to the ecliptic, the Sun's yearly path through the zodiac. The two points where the orbits cross are the lunar nodes. At the North Node, or ascending node, the Moon crosses going north; at the South Node it crosses going south, always exactly opposite. Eclipses happen only when a new or full moon falls near one of them, which is why the 2027 eclipse calculator and the nodes belong to the same geometry.
The Sun's pull makes the plane of the Moon's orbit wobble, so the nodes slide backward through the zodiac and complete a full circle in about 18.6 years. On average they spend about eighteen and a half months in each sign.
§ 02
True node or mean node?
There are two ways to place the node. The mean node smooths the motion into an even backward drift. The true node follows the Moon's actual orbit from moment to moment, so it rocks back and forth around the mean point; over 1900 to 2099 our engine finds the two up to about two degrees apart, and the true node even moves forward on about a quarter of all days.
Astrologers are split, and astrology programs offer both. This calculator leads with the true node and shows the mean node beside it. Most of the time both sit in the same sign. When they do not, read both descriptions; many astrologers take the true node as the finer measure and the mean node as the traditional one.
§ 03
What your North Node describes
Modern astrology reads the nodal axis as a line of development. The South Node describes what comes naturally, habits and talents that feel like an old coat. The North Node points to what you are learning, the direction that feels unfamiliar and often uncomfortable, yet more rewarding the further you go. The short readings on this page pair each North Node sign with the South Node sign opposite it.
Since the node spends a year and a half in a sign, many people share yours. The house gives it a setting, and a planet close to either node brings that planet's themes to the axis. The birth chart calculator shows every planet and aspect in one wheel.
§ 04
The house of the nodes
With a birth time and place the calculator gives the North Node's house in the Placidus system; the South Node is in the opposite house. A North Node in the tenth house with the South Node in the fourth, for example, is read as growth through public work away from the comfort of home. Without a time the house is left open.
Every 18.6 years the nodes return to their natal place, around the ages of eighteen or nineteen, thirty seven, fifty six and seventy four. Astrologers read these nodal returns as moments when the direction of your life comes up for review, often around an eclipse season.
§ 05
How the nodes are calculated
The mean node uses the standard formula for the mean longitude of the Moon's ascending node from Jean Meeus's Astronomical Algorithms, and agrees with the Swiss Ephemeris to within a fraction of an arcsecond. The true node is the osculating node: from the Moon's position and velocity in the ELP2000-82 lunar theory the engine finds the plane of its orbit at that instant and where that plane cuts the ecliptic. Our checks against the Swiss Ephemeris true node from 1901 to 2099 stay within one arcminute.
Because the true node moves only a few arcminutes a day, and sometimes almost stops, a small difference in position can move the time of a sign change by an hour or more. On a changeover day, treat the minute as approximate and compare with the mean node. The calculation runs in your browser; your birth data is not sent to our server.
FAQ
Frequently asked questions
- Should I use the true node or the mean node?
- Both are in use. The true node follows the Moon's real orbit; the mean node is its smoothed average. They are at most about two degrees apart and usually in the same sign. This calculator shows both, with the true node first.
- Do I need my birth time to find my North Node?
- No. The node spends about eighteen months in a sign, so the date is enough for the sign. The birth time adds the house, which gives the axis its setting in your life.
- Where is my South Node?
- Always exactly opposite the North Node: same degree, opposite sign. If your North Node is at 12 degrees Gemini, your South Node is at 12 degrees Sagittarius. The calculator shows it under the result.
- What do the lunar nodes have to do with eclipses?
- Eclipses happen only when a new or full moon falls close to a node, so the node's sign tells you which part of the zodiac the eclipses of those months fall in. Astrologers watch eclipses near their natal nodes closely.
In the glossary
Read the guide
Moon phases and eclipses