"We not say 'Astrology'. We Indians, say 'JYOTISHI', 'JYOT' - light & 'ISH' -God. Therfore 'Light of God'. Asrtology is a MIRROR to life. It is also a Guide Line. It is certainly Not 100% correct.
Astrology is the study of celestial bodies interpreted as affecting personality, human affairs, and natural events. The primary astrological bodies are theSun, Moon, and planets, which are analyzed by their aspects (relative positions to one another), by their placement in 'houses' (spatial divisions of the sky), and their movement through signs of the zodiac (spatial divisions of the ecliptic)
Sun sign The Sun Sign is the sign in which the Sun stood at the time of birth. Sun takes 365 days to make a Complete transit through the twelve signs of the zodiac; the sun spends about a month in each sign. Your Sun Sign is determined according to what time of the year you were born. It provides a generalized picture of someone's personality.
Your lunar sign is the sign of the zodiac that was just coming up over the eastern horizon at the moment that you were born. Your emotional and instinctual needs in relationships are represented by the Moon's placement in your chart.
Astrologers use the Sun Sign to describe the broad qualities that can be generalized about someone's personality. Zodiac’s Sun Signs to determine their astrological compatibility. However, that is only the top surface of the overall relationship.
To get a different perspective of your compatibility desires based on your emotional needs. The Moon rules over your emotions and deep-rooted feelings. Particularly, the Moon Sign can tell us how we instinctively react within relationships.