When Sun is in 1st Rashi i.e in Aries it is called in its Exalt or uha. It gives best results of that house in the Horoscope. e.g. if 1 rashi i.e. is aries is in 5th house of a Horoscope, it represents a house of childern, name, fame etc., So all these are given in her/his life time when ever Sun will be in Main Dash, Sub Dash or sun is in trsint moves over/aspects 5th house etc.