We have already said that the Five Revolving
Heavens, Jupiter, Venus, Mercury, Mars and Saturn,  represent the Five Great
Elements. There are Five Great Equations in Horary Astrology. When a
querent comes to know about the health condition of a native, these Pancha Maha
Sutras or the Five Great Equations should be used. The three formulas we
have defined already.  Jeeva Sutra is when there is  good relationship between
the Udaya and Aroodha Ascendants, medium relationship means Roga Sutra and bad
relationship between them means Mrithyu Sutra.
 
Read more at www.eastrovedica.com/html/vedic_astrologylesson58.asp