In Astrology, we see Sun Sign to get the certain idea about a person, his/her looks, intrests, nature, temprament, etc.
Sun is the most powerful of all heavenly bodies we can predict the future seeing the placement of Sun. These predictions are not hundered percent accurate but never the less they cannot be discorded as rubbish. For very accurate prediction we need to see the placement of other planets around it. These prediction are based on mathematical calculations of the aspects formed between your natal Sun and the planets around it and they give us a fair degree of accuracy. The fact that they are not based on your exact degree of your natal Sun nor taking into account the additional aspects of the other 8 planets.
The Sun colours our personality so strongly that we amazingly can get an accurate picture of an given individual who was born when it was exercising its powers, throw the known and predictable influences of a certain astrological sign. In absence of a natal chart we will get a quite clean picture of a person upto as much as 60-70% accurate.
Sun Sign: A Zone of zodiac - Aries, Taurus, etc. in which the Sun is placed at the moment you were born.
