The common interpetion of Pushyaarka Yoga is the combination of Pushya Nakshatra and Sunday.
According to Hindu astrology, the favorable alignment of the stars on Pushya Nakshatra day results in prosperity, success and happiness.
Normally it will occur twice or thrice in a year.
somasuryoparaage cha puShyaarkaadi samaagame |
yo.anuttamaM idaMstotramaShTottarashataM japet ||
bhUtapreta pishaachaadi pIDaa tasya na jaayate || 26 || – Raghavendra sthothram
He who recites this unparalleled stotra 108 times when there is an eclipse(either solar or lunar) or when the sun is in the pushya nakshatra position,such a person will not be tormented by ghosts, demons, or spirits.
Madhwa 