Gaja-Kesari Yoga and Guru-Mangala Yoga in Vedic Astrology have been explained here in detail.
If (1) Jupiter is in a quadrant from Moon, (2) a benefic planet conjoins or aspects Juputer, and, (3) Jupiter is not debilitated or combust or in an enemy’s house, then this yoga is present. One born with this yoga is famous, wealthy and intelligent. He has great character and he is liked by kings. For virtuousness and
ever-lasting fame, this is a key yoga.
Some authors consider Gaja-Kesari yoga to be present even when Jupiter is in a quadrant from lagna and not Moon. If he is strong, this yoga can be present even without a benefic’s aspect or conjunction.
If Moon and Jupiter are conjoined in 6H or 8H or 12H, the native becomes blind through excess of seminal effusion.
If Jupiter and Mars are together or in the 7th house from each other, then this yoga is present. One born with this yoga is righteous and energetic. His energies are channelled in dharmic paths.