Planets in houses · Kendra
Rahu in the 1st house
North node · Tanu Bhava
Rahu is the karaka (significator) of ambition, foreign links, technology and desire. The 1st house, called Tanu Bhava, shows self, body and personality. When Rahu sits here, these matters take on its colour.
A malefic in the Lagna gives strength of will and drive, but can make one impatient or harsh and needs care for health.
The 1st house is a kendra (angular house), a pillar of the chart, so a graha here shows its results openly and strongly.
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 1st house counted from your Moon sign, the period traditionally needs more care.
A single placement is never read alone: sign, aspects, conjunctions, dasha and the whole chart change the outcome.