"The placement of the celestial bodies in the heavens at any given moment in time reflects the nature of that moment, including the nature of an individual born in that moment."
There is more to Astrology then just your Sun Sign. Each astrological/zodiac sign has various qualities, characteristics, and traits associated with it. Your sun sign helps to shape your personality. But the moon and all the other planetary bodies also have a unique quality and "energy" of their own. Your personality is a unique combination of influences from not only the Sun, but also from the Moon, and all of the Planets in the solar system. The positions of each of these celestial bodies at the time and place of your birth can give you a more detailed and accurate picture of who you are.
A Horoscope is an astrological forecast based on a chart or diagram that represents the positions of the Sun, Moon, Planets, the astrological aspects, and angles at the time of an event, such as the moment of a person's birth. The 12 Houses of the zodiac are represented in the chart as different spheres of life, physical surroundings and life experiences. The placement of a planet in a house (and also the zodiac sign that the house represents) will determine the area of life in which it acts, and the goals and activities on which its drive or impulse will be focused.
By looking at the positions and aspects of the celestial bodies at the moment of birth, one can create a Natal Chart. By studying and interpreting the Birth Chart one can become aware of the qualities and traits that make up their individual personality and discover how the celestial bodies have influenced past events, and how they are shaping current experiences.
If applied accurately, Astrology can be used for Divinatory purposes by studying and interpreting the patterns, aspects and phases of current planetary activity, in order to gain a better understanding of how their energies can influence the nature of people and events, and to determine the probability of future events and experiences.
The horoscopes that you see in newspapers and magazines can be vague and not entirely accurate because they are being based on just the individuals Sun Sign. For example, those born when the sun was in the sector of the zodiac known as "Pisces" will all share similar general characteristics, and some assumptions can be made about them, but knowing the exact time and place of ones birth, and the positions of the Planets, and other astrological details would give the individual a unique snapshot of there inner nature, positive and negative personality traits, influences, talents, challanges, and probable futures.
Astrology is a wonderful ancient tool that can be used for self-exploration, personal guidance and spiritual wisdom. "Events in the heavens are mirrored by those on Earth, As above, so below."