Zodiac signs or Sun signs are determined by an individual's date of birth. It represents the sign of the zodiac that the Sun was in at the time of birth. Zodiac comprise of 12 different sun signs that are :

Why don't some people seem to fit their astrological sign?
There are two reasons why some people don't seem to fit the descriptive characteristics of their astrological sign. In the first instance, they may not really understand the entire astrological description of their sign and are basing their opinion only on a few generalities. A more thorough explanation often reveals that most individuals do demonstrate the inherent characteristics of their sun sign.

In the second instance, astrological interpretation is based on knowing the complete horoscope of an individual which indicates where all the celestial bodies were positioned at the time of birth. It will reveal how strongly an individual exhibits the traits associated with his or her sun sign. After the sun's sign, the most important position is the sign in which the moon was located at birth.

For example, let's say at the time of birth the sun was in Aries. The moon may also be in Aries at birth but it may just as easily be in any of the other eleven astrological signs. The astrological sign position of the moon has an important bearing on personality and temperament from an emotional point of view. It describes how a person will emotionally handle the characteristics and traits indicated by the position of the sun at birth. Many calendars and almanacs list the daily lunar positions.

In Astrological works, the nine planets have been assigned nine different gemstones. According to the classical famous astrological work 'Jatak Parijat' we can divide the planets and their stones as follows :