In simple words
A birth chart is split into 12 houses, and each house is an area of life. The 3rd house is about: communication, siblings, learning, short trips.
Planets sitting in this house in your chart bring their energy to this area of life. An empty house is normal; it still matters. Houses need your exact birth time.
What the 3rd house covers
It shows how you take in information and pass it on: messages, writing, early schooling and the people you see most often. Planets here make the mind active and the phone busy. It also covers the local streets and routes you know by heart.
Growing through this house
Curiosity grows when you feed it. Read, ask, write, and say the thing clearly the first time.
Planets in the 3rd house
Sun in the 3rd house. You shine through words and curiosity. With the Sun in the third house, you are bright, observant and eager to investigate.
Moon in the 3rd house. You feel through conversation. With the Moon in the third house, talking, writing and moving around help you process feelings.
Mercury in the 3rd house. A born communicator. Mercury is strong in the third house.
Venus in the 3rd house. Graceful words, warm connections. With Venus in the third house, you speak and write with charm.
Mars in the 3rd house. Sharp words and a busy mind. With Mars in the third house, your mind is quick and your speech forceful.
Jupiter in the 3rd house. A big, learning mind. With Jupiter in the third house, you are a natural learner and communicator.
Saturn in the 3rd house. Careful, thorough thinking. With Saturn in the third house, you think carefully and speak with weight.
Uranus in the 3rd house. Lightning-fast, inventive thinking. With Uranus in the third house, your mind jumps to original conclusions and you enjoy unusual ideas and technology.
Neptune in the 3rd house. A poetic, intuitive mind. With Neptune in the third house, you think in images and feelings, and your words can be imaginative and moving.
Pluto in the 3rd house. Words with real power. With Pluto in the third house, your thinking is penetrating and your words can transform others.