A Sun Sign is the zodiac sign in your horoscope where Sun was in transit when you were born. Similarly, a Moon Sign is the sign in which Moon was in transit at the time of your birth.

Sun takes one year or twelve months to travel through the twelve signs. So, it stays in one zodiac sign for around one month. Therefore, it is very easy to calculate a Sun Sign just by looking at the date of birth of a person.

The Moon stays in a sign for around fifty four hours and it takes around twenty eight days to complete its cycle of the twelve signs. Therefore, it is only through looking at the horoscope that we can find out the Moon sign of a person.

In Vedic Astrology or Jyotish the Moon Sign or Janma Rashi is given more importance than the Sun Sign. It forms the basis of a lot of calculations, for naming a person, for match-making and for the general predictions.