Among the most mysterious points in an astrological chart are the lunar nodes. They are neither planets nor stars but mathematical points: yet astrological traditions, from India to medieval Europe, have counted them among the most important factors in the sky. Their story combines precise astronomy, myths of dragons and monsters, and symbolic readings that have changed profoundly over the centuries.
What the nodes are
The Moon's orbit is tilted by about five degrees to the ecliptic, the apparent path of the Sun. The two orbits therefore cross at two opposite points:
- the north node or ascending node, where the Moon crosses the ecliptic moving north;
- the south node or descending node, where it crosses moving south.
The nodes always lie exactly opposite each other and move slowly backwards through the zodiac, completing a circuit in about 18.6 years. They thus remain in each pair of opposite signs for about a year and a half. Astrologers distinguish between the mean node, calculated as a regular motion, and the true node, which follows the small real oscillations of the orbit.
Their astronomical role is decisive: eclipses occur only when the new or full moon falls near the nodes. This is why, in many cultures, the nodes became associated with creatures that devour the Sun and Moon.
The Dragon of the West
In medieval Latin astrology the north node was called Caput Draconis, "the Dragon's head", and the south node Cauda Draconis, "the Dragon's tail". The image was of a celestial dragon coiled around the ecliptic, swallowing the luminaries with its head or tail during eclipses.
Tradition gave the two nodes different natures:
- the Dragon's head was considered similar to the benefics, with a nature recalling Jupiter and Venus: it increases, adds, amplifies;
- the Dragon's tail was considered similar to the malefics, with a nature recalling Saturn and Mars: it subtracts, diminishes, empties.
In particular, the head increased the significance of the planets it was conjunct, while the tail reduced it. In horary astrology the presence of the Dragon's tail beside a significator could indicate loss or diminution.
Rahu and Ketu in Indian myth
In Indian astrology the nodes are two grahas, two "seizers", with their own names and stories: Rahu (north node) and Ketu (south node). The myth tells that during the churning of the ocean of milk, when gods and demons sought the nectar of immortality, a demon slipped in among the gods and managed to drink a sip. The Sun and Moon recognised him and denounced him to Vishnu, who cut off his head with his discus. But the nectar had already made the demon immortal: the head became Rahu, the body Ketu. Ever since, in revenge, Rahu tries to swallow the Sun and Moon, causing eclipses, which are brief because the luminaries re-emerge from his severed throat.
This tale illustrates with extraordinary precision the link between nodes and eclipses, and shows how ancient and widespread the symbolism of the nodes is.
The modern reading
In the twentieth century a new interpretation spread, often called karmic:
- the south node would represent what you bring from the past, habits and talents already acquired, a comfort zone;
- the north node would indicate the direction of growth, what you are called to develop.
It is important to know that this reading is modern and does not belong to classical Western astrology, which saw the nodes mainly as amplifiers and reducers. Both perspectives can be useful if used with awareness: one describes a mechanism, the other proposes a path.
The nodal return
Since the cycle lasts about 18.6 years, the nodes return to their natal position around the ages of 18-19, 37, 56 and 74. Many astrologers regard these moments as passages in which the direction of life is redefined. Around nine and a half, 28 and 46 the nodes are instead reversed relative to birth.
How to observe the nodes in your chart
- Identify the axis of signs in which the nodes lie: it indicates a polarity between two ways of being.
- Look at the houses the nodes occupy: they show the areas of life involved.
- Note any planets conjunct one of the nodes: according to tradition, beside the head they are amplified, beside the tail reduced or turned inward.
At Studio Esoterico Cornelio the nodes are read as an axis of balance: there is no good pole and bad pole, but two directions to be integrated.
In short
- The lunar nodes are the points where the Moon's orbit crosses the ecliptic.
- They move backwards and complete the zodiac in about 18.6 years.
- Western tradition called them the head and tail of the Dragon, one increasing and the other subtracting.
- The Indian myth of Rahu and Ketu explains their link with eclipses.
- The karmic reading of north and south node is a modern interpretation.