In Indian vedic astrology, predictions are calculated based on the Moon sign whereas in western astrology, predictions are based on Sun sign.

Moon stays in each house for two and a quarter days and in each nakshatra for 13* 20 min.

I.e Moon stays in each nakshatra for 800 minutes.The predictions based on the current planetary position is called as “Gochara”.

The horoscope calculated at the time of birth is a permanent one.The daily predictions are calculated with the current planetary positions in a horoscope.

Since it is calculated based on the present moment,it can be taken as a guiding force to take decisions in life.