2. Many years ago, Greek astronomer Hipparchus (190-120 BC) divided the ecliptic into 12 sections to mark the position of the sun on the ecliptic, taking the vernal equinox as 0 ° and counting from the vernal equinox (i.e. zero degree of the ecliptic); Every 30 ° is a house, named after the main constellations contained in each house at that time, followed by Aries, Taurus, Gemini, cancer, lion, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces and other houses, which are called the twelfth house of the zodiac.