What is the third house of the constellation?

In astrology, the most commonly used and best way to interpret is the third house of the constellation. The so-called trine, that is, the quartering of the twelve constellations, divides the twelve constellations into four groups, each group includes three constellations, and the distance between each of the three constellations in the zodiac is 120 degrees. Each group of constellations has an element code, which is used to express the similarities and differences of this group of constellations, forming the following configurations: fire: Aries, Leo, Sagittarius. Earth signs: Taurus, Virgo, Capricorn. Air signs: Gemini, Libra and Aquarius.