What effect does the ecliptic geomantic learn to han dynasty?

In China's ancient astronomical observation for a long time, a year, found the sun in the sky through a circular path, the ancients called this path "ecliptic", when in fact it is the sun in earth's orbit reflected in the projection of the earth.The sun along the ecliptic the earth a year round, in order to facilitate to determine the location of the sun, people divided into ten halves (each equal to 30.With a neighbouring constellation, the constellation is referred to as the signs of the zodiac.

The stars on the ecliptic is the ancients were divided into 28 constellation, called the "stars" 28, and put them into the east, south, west, north four palace, seven stars, each palace with blue dragon, white tiger, rosefinch, black for four palace name.Feng shui is used on the left tsing lung, right white tiger, QianZhuQiao, the concept of right basaltic up to now.

In the han dynasty, people invented according to the methods to choose the ecliptic auspicious day, namely "pick an auspicious day".