Full and New Moon Hindu Rituals and Dates

Harvest moon in Japan 2013.
Naoyuki Noda/Taxi Japan/Getty Images

Hindus have believe that the fortnightly cycle of the moon exerts a great influence on the human anatomy, just as it affects the water bodies on earth in cycles of tides. During a full moon, a person may tend to become restless, irritable and ill-tempered, showing signs of behavior that hints of 'lunacy'— a term derived from the Latin word for moon, "luna." In Hindu practice, there are specific rituals for the new moon and full moon days.

These dates are mentioned at the end of this article.

Fasting On Purnima/ Full Moon

Purnima, the full moon day, is considered auspicious in the Hindu Calendar and most devotees observe fast throughout the day and pray to the presiding deity, Lord Vishnu. Only after a whole day of fasting, prayers and a dip in the river do they take light food at dusk.

It is ideal to fast or take light food on full moon and new moon days, as it is said to reduce the acidic content in our system, slows down the metabolic rate and increases endurance. This restores the body and mind balance. Praying, too, helps in subduing the emotions and controls the outburst of temper.

Fasting on Amavasya/ New Moon

The Hindu calendar follows the lunar month, and Amavasya, the new moon night, falls at the beginning of the new lunar month, which lasts for about 30 days. Most Hindus observe a fast on that day and offer food to their ancestors.

According to Garuda Purana (Preta Khanda), Lord Vishnu is believed to have said that the ancestors come to their descendants, on Amavasya to partake of their food and if nothing is offered to them they are displeased. For this reason, Hindus prepare 'shraddha' (food) and await their ancestors.

Many festivals, such as Diwali, are observed on this day, too, since Amavasya marks a new beginning. Devotees vow to accept the new with optimism as new moon ushers in the hope of a new dawn.

How to Observe a Purnima Vrat / Full Moon Fast

Usually, the Purnima fast lasts for 12 hours--from sunrise to sunset. People on fast do not consume rice, wheat, pulses, grains and salt during the duration this time. Some devotees take fruits and milk, but some observe it rigidly and go even without water depending on their capability of endurance. They spend time praying to Lord Vishnu and conducting the sacred Shree Satya Narayana Vrata Puja. In the evening, after sighting the moon, they partake of the 'prasad' or divine food along with some light food.

How to Perform a Mritunjaya Havan on Purnima

Hindus perform a 'yagna' or 'havan' on purnima, called the Maha Mritunjaya havan. It is a significant and powerful ritual very simply undertaken. The devotee first takes a bath, cleanses his body and wears clean clothes. He then prepares a bowl of sweet rice and adds to it black sesame seeds, diced 'kush' grass, some vegetables and butter. Then he lays the 'havan kund' to strike the holy fire. On a designated area, a layer of sand is spread and then a tent-like structure of wooden logs is erected and smeared with 'ghee' or clarified butter. The devotee then takes three sips of the Gangajaal or holy water from the river Ganga while chanting "Om Vishnu" and lights the sacrificial fire by placing camphor on the wood. Lord Vishnu, along with other Gods and Goddesses, are invoked, followed by the chanting of the Mritunjaya mantra in honor of Lord Shiva:

Om trayam bakkam, yajaa-mahe
Sugan-dhim pushti-vardhanam,
Urvaa-rooka-miva bandha-naam,
Mrityor mooksheeya maamritaat.

The mantra is ended with "Om Swaahaa." While uttering "Om swaaha", a little helping of the sweet rice offering is placed on the fire. This is repeated 108 times. After completion of the 'havan' the devotee must ask for forgiveness for any mistakes he has unknowingly committed during the ritual. Finally, another 'maha mantra' is chanted 21 times:

Hare Krishna, Hare Krishna,
Krishna, Krishna Hare Hare,
Hare Rama, Hare Rama,
Rama Rama, Hare Hare.

At the end, just as the gods and the goddess were invoked at the onset of the havan, similarly, after its completion, they are requested to return to their abodes.

Moon Calendar and Vrata Dates

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Das, Subhamoy. "Full and New Moon Hindu Rituals and Dates." Learn Religions, Feb. 8, 2021, learnreligions.com/purnima-and-amavasya-hindu-fasts-1770182. Das, Subhamoy. (2021, February 8). Full and New Moon Hindu Rituals and Dates. Retrieved from https://www.learnreligions.com/purnima-and-amavasya-hindu-fasts-1770182 Das, Subhamoy. "Full and New Moon Hindu Rituals and Dates." Learn Religions. https://www.learnreligions.com/purnima-and-amavasya-hindu-fasts-1770182 (accessed June 5, 2023).