In most astrological systems, horoscopes are drawn up as if the Earth were the center of the local planetary system. This is known as being geocentric. Debunkers have attacked astrology for this because our solar system is heliocentric, or sun-centered. However, the main chart used in astrology, the natal horoscope, is simply a picture of the skies at the time and place where a person was born, indicating relative positions of planets and stars. As such, it is a completely accurate view. Currently, there are some astrological systems that use a heliocentric model, but they are most often used as secondary resources.