The third house
The third house is your near world: siblings, neighbours, short trips, daily talk and the way you learn.
What the third house covers
The third house covers communication, early school, siblings, cousins, neighbours, local travel and the messages of the day. Planets here shape how you speak and think. Mercury feels at home here. Mars here argues well and sometimes too much.
Hath signification of Brethren, Sisters, Cozens and Kindred, Neighbours, small Journeys, or inland-Journeys, oft removing from one place to another, Epistles, Letters, Rumours, Messengers.
Transits through the third house
Transits through the third house fill the calendar: more calls, more errands, a course, a car, a sibling who needs you.
Your the third house
Houses come from your birth time and place. The sign on the cusp of the third house and the planets in it are yours alone. Solstice works them out and tells you when a planet moves through it.