Understand your chart

Rahu and Ketu in astrology: understanding the lunar nodes axis

Rahu and Ketu are the two lunar nodes, a central axis of Vedic astrology. They are not planets, but calculated points. Here is what they are, what they symbolise, and how Arcanastra reads them.

What are Rahu and Ketu?

The Moon orbits the Earth on a plane slightly tilted from the ecliptic, the apparent plane of the Sun's path. These two planes cross at two points: the lunar nodes. Rahu is the point where the Moon moves north, Ketu the opposite point, moving south.

Rahu and Ketu are therefore not physical bodies like the planets: they are points calculated from the Moon's real motion. Vedic astrology, jyotish, names them graha alongside the planets, but their nature stays that of calculated points, not visible bodies.

Why speak of an axis?

By geometric construction, Rahu and Ketu are always exactly opposite: when one sits in a sign, the other sits in the opposite sign, 180 degrees away. They can never be apart. This is why we speak not of two independent points, but of a single axis crossing the chart.

Rahu and Ketu are the two ends of one axis: one never comes without the other.

This axis links two complementary poles: what you are drawn toward and what you already know. Traditional Vedic reading sees in it a tension between a pole of exploration and a pole of familiarity. It is a symbolic framework, not a mechanism that would decide for you.

Rahu: what it symbolises

Rahu, the north node, is symbolically associated with attraction, expansion, appetite, the pull toward still-unfamiliar ground. It amplifies whatever it touches and pushes toward the unaccustomed, what has not yet been integrated.

This drive can be a source of momentum as much as of excess: Rahu magnifies and intensifies, without built-in measure. Its meaning is never read alone: it depends on the sign, the house and the rest of the chart where it falls.

Ketu: what it symbolises

At the opposite end, Ketu, the south node, is symbolically associated with letting go, detachment, familiarity, what is already acquired. Where Rahu amplifies, Ketu reduces, turns inward, brings back to the essential.

Ketu evokes an area where you feel on known ground, sometimes to the point of losing interest in it. The Vedic tradition reads there an acquired ground not to flee but to move beyond. Like Rahu, it takes on meaning only in context, never in isolation.

Rahu and Ketu are never read separately

Because they form an axis, reading Rahu without Ketu, or the reverse, makes no sense: the two poles answer each other. Rahu's attraction is lit by what Ketu already holds in reserve, and vice versa.

A chart is read as a whole: the nodal axis is no exception to that rule.

And the axis itself is never interpreted cut off from the rest: the Sun, the Moon, the planets, the houses and the aspects all enter into dialogue with it. No point, however important, sums up a chart on its own.

North Node, South Node, Rahu, Ketu: same geometry, different traditions

Western astrology speaks of the North Node and South Node; jyotish, of Rahu and Ketu. Geometrically, these are the same points: Rahu matches the North Node, Ketu the South Node. The position does not change from one tradition to the other.

What differs is the interpretive framework. The two traditions do not read these points with the same keys, and it would be wrong to treat them as interchangeable in every respect. They overlap in geometry, not necessarily in the meaning they draw from it: this crossing is exactly what Arcanastra's Tropical-Vedic approach explores.

Sign, house and nakshatra: context changes everything

The axis's meaning depends first on the sign each node occupies, then on the house, the area of life, where it falls. The same Rahu is not read the same way whether it colours relationships, work or home. The house requires an exact birth time.

Vedic reading adds a layer: the nakshatra, one of the twenty-seven sidereal sectors, that each node occupies. It is a level of detail specific to this approach. You can explore the nakshatras one by one to understand this grid.

Tropical reading and the Vedic layer at Arcanastra

At Arcanastra, the signs and degrees are calculated in the tropical frame, on the calendar of the seasons, while the nakshatras are read in the sidereal frame, on the fixed stars. The Rahu-Ketu axis sits within this dual reading: its tropical position, and the sidereal nakshatra of each node.

This is the heart of the Tropical-Vedic approach: the depth of the Vedic tradition, of which the nodal axis is part, set on the precision of the tropical calendar. The notions of karma or past lives sometimes linked with Rahu-Ketu belong to this traditional symbolic reading, not to established facts.

How to find your Rahu and Ketu

To locate your Rahu-Ketu axis, you need your date, time and place of birth. Your free birth chart calculates them in seconds, in the "Vedic layer" section, with the sign, house and nakshatra of each node. No email, keeping none of your data.

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Rahu and Ketu in brief