Pillar article
Transit Rahu on the Natal Ketu
When transit Rahu enters the sign that holds natal Ketu, transit Ketu stands on natal Rahu in the same season. The nodes are always opposite, so the axis of the birth chart is reversed for the length of that transit. No date for the transit is stated here. The ephemeris of the year has to supply it.
Geometry before prediction
Natal Rahu in the 10th means natal Ketu in the 4th. Transit Rahu on that Ketu means transit Rahu in the 4th and transit Ketu in the 10th. Career and home swap their nodal visitors. The houses involved are whatever signs the birth nodes occupy, counted from the lagna. Gochar tradition also counts from the Moon, so the same transit can fall in a different house from Chandra than from the lagna. Say which count you are using. A person who only knows a Sun sign does not know either house.
What the flip tends to stir
The house transit Rahu enters becomes louder, stranger, and more outward. The house transit Ketu enters becomes thinner, more inward, or more ready to shed. On the natal Ketu sign, that shedding meets a house the person already experiences as Ketu's territory. The result is not automatically a crisis. If natal Ketu is in the 12th, transit Rahu there stirs foreign residence and expenses, topics the 12th already owns. The running Vimshottari dasha decides whether the transit has a partner. A Rahu mahadasha during this flip is a double Rahu story. A quiet Mercury mahadasha with no link to those houses can let the transit pass as a mood.
Natal conjunction is a different figure
Rahu and Ketu never share a sign in the sky, so 'Rahu entering Ketu's sign' is not a birth conjunction. Some later books give Ketu a sign rulership. That is not what this transit means. The sign is the one natal Ketu occupies in your chart, which differs for every lagna. Remedies timed to a headline about the nodes changing signs, without your natal signs, are aimed at the sky in general. Your version of the event is the two houses named above, read with the dasha already running.
Frequently asked questions
Do Rahu and Ketu ever occupy one sign at birth?
No. They are opposite. A birth chart with both nodes in one rashi is a calculation error, not a yoga.
Is this the same as Rahu returning to its own natal sign?
Rahu returning to natal Rahu is the other end of the cycle. Rahu on natal Ketu is the halfway flip, with Ketu then on natal Rahu. They are two different transits.
Should I read it from the Moon or the lagna?
Classical gochar counts from the Moon. The houses of the birth chart count from the lagna. Note both if they differ, and do not let a Sun-sign column replace either.
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D1, D9, D10, dashas, yogas, and transits, the same calculations referenced in this article.