What are the zodiac signs?

The word zodiac comes from the Greek zodiakos, which means zoo. In the eyes of the Greeks, constellations are made up of various animals, which is the origin of the names of the twelve constellations. In astronomy, the earth's orbit around the sun is called the ecliptic. The width of the ecliptic is 18 degrees, and its orbit around the sun is 360 degrees. The ecliptic plane includes the orbits and constellations of all planets. There is a constellation every 30 degrees, a total of twelve constellations, called "Zodiac". In calendar science, the division of the zodiac is itself a solar calendar. Starting from the vernal equinox, every 30 degrees of the apparent motion of the sun on the ecliptic is a solar month. It should be pointed out that the palace names of the zodiac are borrowed from the names of nearby constellations, just like the image of the zodiac borrowed by the twelve earthly branches in China calendar, which is different from the actual constellations. Zodiac, an Arabic astrological term, originated in Babylon. Arab astrology can be divided into "southern Arab astrology" and "northern Arab astrology". The former is also called "Yemeni astrology", which is a traditional astrology. The latter is also called "western astrology", which is modern astrology.

In the eyes of the Greeks, constellations are made up of various animals, which is the origin of the names of the twelve constellations. In astronomy, the earth's orbit around the sun is called the ecliptic. The width of the ecliptic is 18 degrees, and it is 360 degrees around the earth. The ecliptic plane includes the orbits of all planets except Pluto, including constellations. There is exactly one constellation every 30 degrees, a total of twelve constellations. These twelve sections are called "Zodiac". The sun runs from west to east on the ecliptic, and it goes around the sky once a year. More than 2000 years ago, there were roughly twelve constellations on a belt on both sides of the ecliptic. They are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces. People on earth can see them one after another in a year.

Babylonians observed these constellations for a long time, determined the ecliptic through observation, and divided the ecliptic into 12 equal parts, each equal part was 30 degrees, which was called 1 segment. The sun orbits the ecliptic in 12 months 1 cycle, so it runs on the ecliptic once a month. In the eyes of the ancients, the sun was Apollo, and its resting place must be a magnificent palace. Therefore, they call a section of the ecliptic a palace. In this way, the section 12 on the ecliptic becomes the "zodiac". The names of the zodiac signs are similar to the 12 constellation near the zodiac signs, namely Aries, Taurus, Twin Uterus, Cancer, Lion, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces.

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