The yoga you're mentioning is one of the 27 Soli-Lunar yogas or combinations between Sun and Moon which tells us about the interaction between Sun and Moon on a particular day at a particular time. Everybody gets one of these at birth, it's part of the Panchanga. Vaidriti is not an auspicious one. The description you get about this yoga is rather cryptic - they mostly are. In fairness, these yogas are more used in electional astrology than in natal astrology, so I wouldn't pay it much notice. Only when the message the yoga conveys is the same message one gets, repeatedly, when reading the chart, then the yoga has some value.. other than that, not really.
Faith is the bird that sings when the dawn is still dark.