Parsva Ekadashi is a holy Hindu event. The Sanskrit word ‘Parsva’ means side or flank. However, this word is also used in certain Yoga poses.
On this Gregorian date of the 20th of September, falls Ekadashi called Parsva Ekadashi, ex Delhi. Parsva Ekadashi is called Vishnu Parivartan Ekadashi, Jayanti Ekadashi, Vamana Ekadashi, and Jal Jilani Ekadashi. Lord Vamana was the 5th avatar of Lord Vishnu.
There are two Ekadashis in a month. Sanskrit word Ekadashi means the 11th day, Tithi of every bi-monthly moon cycle, i.e., one in Shukla Paksha and the other in Krishna Paksha. Shukla Paksha is the waxing-rising phase of the moon, and Krishna Paksha is the waning-decreasing phase of the moon. Ekadashis are considered very auspicious days for Vrat, fasting, remembrance to God that generally bring good wellbeing, good health-wealth, success, forgiveness of any sins etc.
Parsva Ekadashi falls on the 11th day of the Shukla Paksha in the Hindu lunar calendar month of Bhadrapad. This always corresponds to the Gregorian August-September period. The Vrat and Puja, prayers are done mainly for Lord Vishnu, but some natives also observe for Lord Krishna and-or Lord Ganesha. It is believed that Lord Vishnu changed his sleep position at this time, from the left side to the right, hence the name Parsva Ekadashi. It also marks the change of the season.
Devotees observe Vrat, fast from early in the morning of the Parsva Ekadashi date, throughout the day to its Parana. Devotees perform Puja, prayers to Lord Vishnu, some devotees also for Lord Krishna and Lord Ganesha. In the legend, Lord Krishna had explained and informed about this Ekadashi on reply to the inquiry of Yudhisthira Maharaj. There is also a story behind the legendary King Bali. Though King Bali was born into a family of demons, he was an ardent follower-worshiper of Lord Vishnu. So he had superpowers. He was once taught a lesson.
A Mantra for Lord Vishnu is—
Om Namo Bhagavate Vasudevaya