Planets in houses · Upachaya
Budh in the 3rd house
Mercury · Sahaja Bhava
Budh is the karaka (significator) of intellect, speech, business and learning. The 3rd house, called Sahaja Bhava, shows courage, siblings and effort. When Budh sits here, these matters take on its colour.
In the 3rd house a benefic makes one gentle in effort; it favours communication, writing and good relations with siblings, though drive may be soft.
The 3rd house is an upachaya (house of growth): results improve steadily with time and effort.
Budh gives its best results here when it is exalted in Kanya, in its own sign (Mithuna and Kanya) or in a friendly sign, and when it is not combust.
Results are weaker if Budh is debilitated in Meena, combust, or afflicted by malefics.
In transit (gochar)
When Budh transits the 3rd 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.