What's your sign, baby? For those who believe in astrology the planet and constellation you were born under will have a massive impact on the course of your life, from what occupation you succeed at to who you fall in love with.

With twelve different star signs in the Western Zodiac everyone fits into one of the signs. Many believe that people from each star sign possess certain talents and other characteristics that are rarely found in other zodiac signs.

Astrology using star signs dates back to the earliest days of recorded astronomy from the ancient Sumerians to the Babylonians, Greeks and Egyptians. They were later associated with the four classical elements, air, water, fire and earth into which we categorize the star signs today.

The interaction of these different elements is important in determining the compatibility of different signs, although not every sign always plays by the overall rules and may be more compatible with signs from different elements than other star signs in the same element group. Signs that are grouped as Fire and Air tend to be more extroverted and often masculine while Water and Earth signs are more often introverted and feminine.

Air signs tend to be very communicative, great at socializing and conceptualisation, so if you're a Gemini, Libra or Aquarius these characteristics should match you. People with a fire sign - Aries, Leo and Sagittarius - meanwhile tend to be more enthusiastic, often have deep faith and love expressing themselves. The earth signs, which are Taurus, Virgo and Capricorn tend to be practical and cautious people, very much based in the material rather than spiritual world. People who are Cancer, Scorpio and Pisces are from the water element: they tend towards emotion and sensitivity, allowing them to relate and empathise more easily than those from other star signs.

As well as the four elements there are the three modalities. These are Cardinal, Fixed and Mutable. For Christians who believe in astrology each one of the modalities represents a part of the Trinity. It's these modalities which give each star sign a different characteristic than the other ones within the same element. Cardinal modality gives the star signs in it, Aries, Cancer, Libra and Capricorn a tendency towards action and taking the initiative. Those in the Fixed modality are often very different: they're more resistant to change. If you're a Taurus, Leo, Scorpio and Aquarius you're likely to be set in your ways and very different from those with a Mutable modality. Mutables, those who are a Gemini, Virgo, Sagittarius or Pisces, are the most adaptable. They won't resist change, but neither will they often be the initiators of it.

By combining the star signs elements and modalities you can discover the personalities of each star sign. Libra's, as Cardinal Airs, are likely to be socialisers who go out and meet new people, for instance. Each star sign is different and much can be discovered from knowing which you are. However there recently has been a challenge to the accepted star sign dates, so you should be cautious and consider that you might actually be a different star sign using the new dates than you were according to the old dates.