Sep 25, 2017 - The zodiac is a certain zone of the sky, along which some planets move, the Moon and the Sun, bypassing 12 constellations on their way. Zodiac constellations are constellations that lie along the plane of the ecliptic. Even then, some of the chosen 12 didn't fit neatly into their assigned slice of the pie and slopped over into the next one. There are 13 zodiac constellations. Each of them in ancient astrology was designated or accompanied by a symbol, which is called the sign of the zodiac. The astronomical zodiac actually contains 13 star signs - the 12 that we're familiar with plus another one, called Ophiuchus. Sep 25, 2017 - The zodiac is a certain zone of the sky, along which some planets move, the Moon and the Sun, bypassing 12 constellations on their way. 13 of these constellations cross or touch the ecliptic – the trajectory of the Sun’s apparent path across the sky as seen from Earth. Most people know of 12 constellations that make up the ecliptic zodiac.

They created the zodiac for their convenience, using a 12-month calendar based on moon phases and leaving out a 13th sign that didn't "fit."

Ophiuchus was deliberately left out of the original zodiac, over 2000 years ago, even though the Sun clearly passes in front of it after passing in front of Scorpius (commonly known as Scorpio) and before reaching Sagittarius. Sidereal astrology uses the actual constellation in which the sun is located at the moment of birth as its basis; tropical astrology uses a 30-degree sector of the zodiac as its basis. The Zodiac The zodiac constellations are the constellations that are located within a band that is about 20 degrees wide in the sky. Since they are located in the zodiacal field, they got their name — the constellation of the zodiac. The ecliptic, or the apparent path of the Sun, is defined by the circular path of the Sun across the sky, as seen from Earth. Tropical astrology is the most popular form and it assigns its readings based on the time of the year, while generally ignoring the positions of the sun and constellations relative to each other.

The zodiac is the group (or “belt”) of constellations that fall along the plane of the ecliptic. Ophiuchus, 13th constellation of zodiac. The zodiac was also created using the physical placement of Earth 3,000 years ago. (Other cultures and traditions have recognized as many as 24 constellations in the zodiac.) But even according to the Babylonians' own ancient stories, there were 13 constellations in the zodiac. The 12 signs of the tropical zodiac represent equal 30 degree divisions of the sky, while the 13 constellations of the zodiac are of various sizes. It is through these constellations that our Sun appears to “pass” during the year. Each of them in ancient astrology was designated or accompanied by a symbol, which is called the sign of the zodiac. Since they are located in the zodiacal field, they got their name — the constellation of the zodiac.

In other words, the Sun appears to pass through these constellations over the course of a year. The essay explained that the zodiac was based on the Babylonians' understanding of the world, three millennia prior. This band is considered special because it is the band where the Sun, the Moon, and the planets all move. Modern astronomy records 88 constellations covering the southern and northern hemispheres of our sky. Located in the Southern Hemisphere, Capricornus represents a creature that is a blend of fish and goat; the name means "goat horn" in Latin. Bu, there are two more that are often left out. The paths of the Moon and visible planets are also within the belt of the zodiac..
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Ophiuchus, which is known in astrological terms as a “snake bearer,” is located between the constellations Aquila, Serpens, and Hercules, just northwest of the Milky Way.

The zodiac is an area of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year.