The North Node and South Node are the two points where the Moon's orbit crosses the Sun's path through the sky. They are not planets, but they are real, calculated positions, and eclipses happen near them. In astrology the South Node describes what feels familiar and comes naturally, while the North Node points toward the direction you are asked to grow. The two nodes always sit exactly opposite each other.
From Earth, the Sun seems to travel along a path called the ecliptic. The Moon travels along its own path, tilted about 5 degrees from the Sun's. Twice a month, the Moon crosses the Sun's path.
The crossing where the Moon heads north is the North Node, also called the ascending node. The crossing where it heads south is the South Node. Because they are two ends of one line, they are always 180 degrees apart.
Eclipses only happen when a New Moon or Full Moon falls close to a node. That is why the nodes mattered to sky-watchers long before modern astrology. The eclipses guide explains more.
The nodes slowly move backward through the zodiac, against the usual direction of the planets. They take about 18.6 years to go all the way around.
That works out to roughly 18 months in each sign. So everyone born within the same year and a half or so shares the same node signs.
There are two ways to calculate them. The "mean" node smooths out the motion. The "true" node follows the Moon's wobbles and can differ from the mean by up to about 1.5 degrees. Both are used, and the difference rarely changes the sign.
Astrologers read the South Node as what comes easily: skills, habits and ways of coping you already know well. It can feel like home, or like a default setting.
That comfort has a downside. Leaning on the South Node too much can feel safe but a little stuck, like repeating an old routine. Some traditions describe it in terms of past lives. Others simply read it as early patterns and inborn talent.
Say your South Node is in Virgo. Fixing, sorting and helping may come as second nature. You might be the one who always notices what needs doing. The risk is getting so busy with details that there is no room left to rest, trust or simply feel.
The North Node points toward qualities that feel less natural at first but bring a sense of growth. It is often described as a direction rather than a destination.
The idea is not to abandon the South Node. It is to use its skills in service of the North Node's lessons.
Say your North Node is in Libra, so your South Node is in Aries. Acting alone and fast may come easily. The growth edge is learning to cooperate, listen and share decisions. You still keep your Aries courage. You just use it on behalf of a partnership too.
Because the nodes are always opposite, there are only six pairs. Each is named by North Node first.
In Vedic astrology the North Node is Rahu and the South Node is Ketu. They are counted among the nine grahas, the chart's main bodies, and are sometimes called shadow planets.
Rahu is linked with desire, ambition and hunger for new experience. Ketu is linked with detachment, spiritual insight and letting go. Both are always treated as moving backward.
Rahu and Ketu also have their own long periods in the dasha timing system, 18 and 7 years. Vedic charts use the sidereal zodiac, so the node signs may differ from a Western chart. The Western vs Vedic guide explains why.
About every 18.6 years, the nodes come back to where they were at your birth. This happens around ages 18 to 19, 37, 56 and 74.
Astrologers often read these as windows for rethinking direction. It is a time when questions about purpose may come up more readily. Like any transit, it opens a period for reflection rather than setting a fixed event.
Your node signs come from your birth date alone, since they move so slowly. Finding their houses needs a birth time.
You can see your own birth chart to find your North Node. Then look at the South Node sign opposite, and think about which of its habits feel like your default. That contrast is usually where the nodes make the most sense.
No. They are calculated points where the Moon's orbit crosses the Sun's apparent path. Vedic astrology still counts them among its nine grahas as Rahu and Ketu.
About 18 months. The full cycle through all twelve signs takes around 18.6 years.
Not for the sign, which usually stays the same for months. You do need a time to know which house it falls in.
No. The South Node shows real strengths. The usual reading is to keep those strengths and bring them toward the North Node's direction.