As per the Vishnu Dharma Shastra, there is a special mention regarding Amavasya as the day largely marked for souls of the forefathers or the Pitrus. This particular day is widely dedicated to the worship or remembrance of the forefathers. The day is also marked for performing the rites, rituals and prayer for the departed ancestors.
It is to be noted that the new moon or Amavasya is the last day of the waning moon. It is to be remembered that based on the lunar calendar, the occurrence of Amavasya is marked by the 30-day lunar cycle. The fifteenth day of the dark half of a lunar month happens on the conjunction of the sun and the moon.
According to the local legends, Barhisadas had a mentally conceived daughter named Acchoda. It is to be noted that Barhisada Pitrs are those people who directly live on the divine juice named as soma juice. It is to be remembered that Acchoda didn’t have a father. She really lacked the love, affection and care of a father. She also carried a constant desire to have a real father.
This result of her wholehearted yearning for a mortal made her to loose all her effective and efficient divine and yogic powers. She also fell from the Heaven.
When she was falling, she prayed to be saved. This prayer was heard by the souls from the pitru loka who reside in the world of the forefathers. They rescued her when she was passing through their region. They also advised her to be born as the daughter of the popular king named Amavasya.
It is to be noted that King Amavasya was a erudite, prudent and radiant man. She also regained her power. As thanks giving Acchoda performed rites, rituals and prayers for the Pitrus.