Rahu Transit Hub

What is Rahu Gochar?

Rahu Gochar (राहु गोचर) is the transit of Rahu, the ascending lunar node — the point where the Moon's orbital path crosses the ecliptic heading north. It is not a physical body. Classical Vedic texts call it one of the Chhaya Grahas (shadow planets), and pair it with its opposite point, Ketu, as a single karmic axis rather than as two independent planets.

Rahu and Ketu are always exactly 180° apart: when Rahu enters Aquarius, Ketu enters Leo at the same instant. This page focuses on Rahu alone — for Ketu's own live position, date lookup and year timeline, see the dedicated Ketu Transit Hub. Rahu's transit is also known as Rahu Peyarchi (Tamil) or Rahu Sanchar.

Why the nodes are treated as always retrograde

Classical practice treats the nodes as permanently Vakri. The crossing points drift backwards through the zodiac at roughly 0.05° per day, completing a full circuit in about 18.6 years. The mean node never deviates from that at all. The true node — which these pages use — wobbles around the mean and does drift forward for a few days at a time, roughly a quarter of all days, but never long enough to form a station or a window worth listing. That is why these pages carry no retrograde badges: there is nothing listable to flag, not because the motion is literally uniform.

The Rahu sign shift — and why nakshatra changes are different

Because Rahu is a shadow point it is also never combust — there is no body for the Sun's rays to overwhelm, so the classical combustion orbs that apply to Mercury, Venus, Mars, Jupiter and Saturn simply do not apply here.

The event that does matter is the sign shift: roughly every 18 months Rahu moves into a new sign, and because it is locked 180° from Ketu, both ends change sign at the very same instant — 12 signs is an even number, so the opposite point always lands exactly on a sign boundary too. A shift from Aquarius to Capricorn (with Ketu mirroring from Leo to Cancer) relocates the whole karmic axis of a chart in one move. These shifts are the most-watched nodal events in Vedic astrology, and the year timeline lists every one with its exact time.

Nakshatra changes do not work the same way. There are 27 nakshatras — an odd number — so 180° spans exactly 13.5 of them. The point exactly opposite a nakshatra boundary falls in the middle of another nakshatra, not on its edge. So while Rahu and Ketu always change sign together, they never change nakshatra together: each node crosses its own nakshatra boundaries on its own schedule.

What Rahu signifies

Rahu, the ascending (north) lunar node, is associated with worldly appetite — ambition, obsession, foreign things and places, technology, and whatever a person is drawn towards but has not yet mastered. Its opposite point, Ketu, the descending (south) node, signifies detachment, past mastery, and what a person disengages from — see the Ketu Transit Hub for a Ketu-focused reading.

Because the two sit six signs apart, they are traditionally judged together. Whatever house Rahu occupies is the area of hunger and pursuit; the opposite house, held by Ketu, is where something is being released or already known.

Rahu's exaltation and debilitation

Rahu does not rule a sign, so the ordinary own sign and mooltrikona dignities do not apply — only exaltation and debilitation are read:

• Rahu exalted across all of Taurus (peak at 20°), debilitated across all of Scorpio.
• Ketu mirrors this exactly — exalted across all of Scorpio, debilitated across all of Taurus — since it always sits 180° from Rahu. See the Ketu Transit Hub for Ketu's own dignity timeline.

Strengthening one end of the axis necessarily weakens the other. Note that classical sources differ here — some texts place Rahu's exaltation at 3° Gemini and Ketu's at 3° Sagittarius. This site follows the Taurus/Scorpio convention used throughout its chart calculations, so the transit pages and the birth charts always agree.

How these calculations are done

Every position, sign entry and nakshatra boundary is computed from the Swiss Ephemeris DE431 dataset using the true node (not the mean node), with Lahiri Ayanamsha applied for sidereal longitudes. Boundary times are resolved to the second by binary search on the ephemeris output rather than estimated from average motion. Ketu is derived as Rahu + 180° at every instant, which is how the birth charts compute it too — so the two ends of the axis can never drift out of opposition.

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