You need to know about "zodiac" basic knowledge of:

1. Why do you want to know the zodiac?

The simple answer is that you learn on the zodiac 12 zodiac signs and their meanings, but even the zodiac is what all don't know, this is not very sorry?

2. Need to know before learning zodiac?

At least want to know what is the celestial sphere, what is the latitude and longitude, what is the celestial pole, what is yellow.

Simply said it was the earth in the universe is infinite expansion of projection, the earth's axis unlimited extension, is projected in the north and south celestial pole, the unlimited expansion of the earth's equator became the celestial equator, north and south celestial pole and the celestial equator with countless circle with up and became a celestial sphere model, the fabric of the earth's projection on the celestial sphere, it becomes the right ascension and declination.

Route of latitude and longitude: the revolution of the earth on the celestial sphere is the projection of the zodiac, rather than parallel to the coil on the celestial sphere is of latitude, instead of the vertical line the coordinates of the intersection is the longitude.Coordinate system to the ecliptic as "equator", is "the ecliptic coordinate system".

Obliquity, the zodiac and the Angle between the celestial equator, also is the axis of the zodiac and the earth's axis, the Angle between the is about 23 ° 27 points.

3. What is the "zodiac"?"Zodiac" and "ecliptic" concept is not the same?

Is different, the concept of "zodiac", unlike "zodiac", in short, the zodiac is a virtual line, while "zodiac" is based on the ecliptic center around each extension 9 °, the total width of 18 ° virtual "zone".(there are 8 ° around each 30 points, the total width of 17 °)

4. Why do you set?"Allow" is how to?

Actually every planet in the solar system have their own orbit, but the track on the earth, is very close to the ecliptic, the only different is the Angle between them.So, in order to be able to accurately record each planet in the region, people find out the deviation Angle the ecliptic, planet is 8 ° 30 points, and the extension 8 ° 30 points on both sides of the zodiac, in order to determine the position of the planets in this particular area.So was born the so-called "zodiac".

"Allow" in astrology, is to take care of these because its orbit planets Angle caused by the deviation on of latitude.So, usually the biggest permissibility only reached 9 °, this kind of visual large star, such as the sun and the farther away from us, the smaller the planets and the smaller the permissible degree between the natural.In general are set under 8 ° to 8 °.

5. With star astrology astronomical constellation differentiate different? (The constellations /astro/zhishi/)

Different, people brought the zodiac this virtual divided into 12 balls, each 30 ° of longitude, and ram, such as Taurus constellation names, but in fact in astronomy, the constellations have greatly small, not just every 30 °, for exampleTaurusAbout 40 ° actually occupied on the zodiac.Therefore, the concept of constellation in astronomy and astrology and semiotics, the number in the symbols of constellation classification is very different.So, even if the vernal equinox in these daysPisces, even a "constellation" 13, this with semiotics and the impact of digital symbol constellation is has nothing to do.