Planets in houses · Upachaya
Rahu in the 3rd house
North node · Sahaja Bhava
Rahu is the karaka (significator) of ambition, foreign links, technology and desire. The 3rd house, called Sahaja Bhava, shows courage, siblings and effort. When Rahu sits here, these matters take on its colour.
In the 3rd house a malefic is at its best: it gives courage, initiative and the will to win through effort.
The 3rd house is an upachaya (house of growth): results improve steadily with time and effort.
Rahu is a shadow graha and gives the results of the sign lord and conjunct grahas; it is considered strong in Vrishabha.
Results are weaker if Rahu is debilitated in Vrishchika, combust, or afflicted by malefics.
In transit (gochar)
When Rahu transits the 3rd house counted from your Moon sign, the period is traditionally favourable.
A single placement is never read alone: sign, aspects, conjunctions, dasha and the whole chart change the outcome.