Rahu and Ketu in Vedic astrology: the lunar nodes explained
Rahu and Ketu are the two points where the Moon's path crosses the Sun's path in the sky. They are not bodies, they are always exactly opposite each other, and they move backwards through the zodiac, taking about 18.6 years to go once round. Vedic astrology treats them as two of the nine grahas and gives each a dasha period, Rahu 18 years and Ketu 7.
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The astronomy in plain words
The Sun appears to travel along a circle in the sky called the ecliptic. The Moon travels along a circle that is tilted about 5 degrees to it, so it crosses the ecliptic twice each month: once going north, which is the ascending node, and once going south, the descending node. Vedic astrology calls the ascending node Rahu and the descending node Ketu. Because the two points are the two ends of one line, Ketu is always 180 degrees from Rahu.
The tilt of the Moon's path slowly turns, so the nodes slide backwards along the ecliptic and complete a circle in about 18.6 years. That is about 18 months in each sign. This is why Rahu and Ketu are called retrograde in every chart, and why their sign changes are slow enough to feel like a long season.
Why they are linked with eclipses
A solar eclipse needs a new Moon near a node and a lunar eclipse needs a full Moon near a node, since only then do the Sun, Earth and Moon line up. The old astronomers noticed that eclipses happen at these two points and gave them a life of their own. That link is why Rahu and Ketu are called shadow planets (chhaya graha) and why eclipse days are treated with special observances in many families.
The myth behind the names
In the story from the churning of the ocean, an asura named Svarbhanu disguised himself among the gods to drink the nectar of immortality. The Sun and Moon noticed and told Vishnu, who cut off his head with the discus, but the nectar had already touched his throat. The immortal head became Rahu and the body became Ketu, and they are said to chase the Sun and Moon and swallow them for a while, which is how eclipses are explained in the story. Tradition keeps the story as a picture of appetite (Rahu, the head that always wants more) and of letting go (Ketu, the body with no head to think with).
How tradition describes them
- Rahu: hunger and ambition, the foreign and the unusual, technology, crowds, glamour, restlessness and obsession. It is said to magnify whatever it touches.
- Ketu: detachment, insight, spiritual search, past habits, isolation and the cutting away of things. It is said to take away interest in what it touches.
- Both are read like the planet they sit with and like the lord of the sign they sit in, since they have no sign of their own.
- Their nakshatras: Rahu rules Ardra, Swati and Shatabhisha, and Ketu rules Ashwini, Magha and Mula.
Mean node and true node
There are two ways of calculating the nodes. The mean node is the smooth, average position and moves backwards at an even pace. The true node adds the small wobbles in the Moon's real orbit, so it speeds up, slows down and sometimes appears to move forwards for a day or two. The two can differ by up to about 1.5 degrees. Vedic Astro Lab uses the mean node, which is the more common choice in Indian software, so a chart from a program that uses the true node can show the nodes in a different degree, and rarely in a different sign.
Where the nodes are now
At the time of writing (October 2026), Rahu is in Aquarius and Ketu is in Leo. Rahu moved into Aquarius in May 2025 and is due to move into Capricorn in early December 2026, when Ketu moves into Cancer. Whether this matters to you depends on where those signs fall in your own chart, which houses they are, and what else sits there. The birth chart calculator shows the nodes in your chart, and a transit reading looks at the nodes' present signs against your Moon sign.
Rahu and Ketu dashas
In the Vimshottari dasha Rahu's period lasts 18 years and Ketu's lasts 7. Traditional readers describe a Rahu period as a time of pushing toward new things, with unusual turns and a stretch of unease, and a Ketu period as a time of drawing inward, simplifying and losing interest in some goals. They are read through the signs and houses the nodes occupy and the planets they join, and are not forecasts. A person whose Moon is in Ardra, Swati or Shatabhisha starts life in a Rahu period, and a person whose Moon is in Ashwini, Magha or Mula starts in a Ketu period.
What is Kaal Sarp dosha?
Some modern astrologers say a chart has Kaal Sarp dosha when all seven planets lie on one side of the Rahu to Ketu line. Names are given to twelve types by the house in which Rahu sits, and expensive rituals are often sold to remove it. The idea is not described in the best known classical texts, and astrologers disagree about whether it is real. Because it only needs the seven planets to fall on one side of a line, a fair number of charts qualify, and the label alone says very little. Treat it as one pattern a reader may mention, not as a verdict, and be wary of anyone who sells fear around it.
Frequently asked questions
Are Rahu and Ketu real planets?
No. They are calculated points on the Moon's orbit, but they are used in Vedic astrology like planets and have their own dasha periods.
Why do Rahu and Ketu always move backwards?
Because the Moon's orbit turns slowly in the opposite direction to the planets' motion. The mean node always moves backwards, and the true node moves backwards with small forward wobbles.
Is a Rahu mahadasha bad?
Tradition links it with ambition, change and some unease, but it is not a prediction of a bad time. Many people describe Rahu periods as ones of rapid growth and new experience.
Is Kaal Sarp dosha real?
It is a modern idea that astrologers disagree about, and it is not in the best known classical texts. Many charts qualify, so it says little by itself.
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