A horoscope/janampatri is a basic tool for making astrological forecasts. To cast your horoscope, your exact time, place, and date of birth is required for astronomical calculations. With free horoscope, you will get your free Ascendant, Moon sign and Nakshatra predictions. Sun Sign is a simplified system of Astrology which considers only the position of the Sun at birth, which is said to be placed within one of the twelve zodiac sign. This sign is then called the Sun sign or Star sign of the person born in that twelfth-part of the year. Your date of birth determines which one you are.