The full-moon day of Avani (July-August) marks the auspicious start of Chaturmas, a four (4) month period of penance and austerity. In ancient India, it was a period of heavy rains; students who lived in gurukuls (ashramas) could not move about freely. Hence this was the time to learn by heart all the earlier lessons, and start further studies. This was done after changing the sacred thread (Yagyopavit), and chanting the Gayatri Mantra.
Menfolk of many communities, including brahmins, kshatriyas and vaishyas of South India, observe the festival of Sravan full moon, or Avani Avittam when the star Avittam is in ascent. After doing japas, the new yagyopavit is worn. Gayatri Mantra (named after poetic metre in which the mantra is composed) is recited before sunrise and after sunset. It is believed to develop spiritual and mental energy and give protection from harmful negative forces. Invoking the sun god, the mantra repeatedly prays for protection from the sins of the mind, of the lips and of the body.
The Legend
The demon Medhas worshipped Brahma, and became powerful. He attacked the sun, and tried to capture his thunderbolt. It was then that Surya, the sun god, recited the
Gayatri Mantra, invoking Varuna with a handful of water. Reciting the mantra before sunrise, at noon and after sunset, he was saved from the demon by mantras of great power and spiritual energy.
Description
Menfolk gather at rivers, ponds, or beside wells, for a bath, and then the new yagyopavit is dipped in turmeric and saffron. Japa is done, Gayatri Mantra is recited by the group, Vedas are recited and the old sacred thread is replaced by the new one. Tarpan or prayer is done for the gods and seven great rishis.
The Gayatri Mantra consists of three lines from Rig-Veda (II.62.X), namely:
Menfolk of many communities, including brahmins, kshatriyas and vaishyas of South India, observe the festival of Sravan full moon, or Avani Avittam when the star Avittam is in ascent. After doing japas, the new yagyopavit is worn. Gayatri Mantra (named after poetic metre in which the mantra is composed) is recited before sunrise and after sunset. It is believed to develop spiritual and mental energy and give protection from harmful negative forces. Invoking the sun god, the mantra repeatedly prays for protection from the sins of the mind, of the lips and of the body.
The Legend
The demon Medhas worshipped Brahma, and became powerful. He attacked the sun, and tried to capture his thunderbolt. It was then that Surya, the sun god, recited the
Gayatri Mantra, invoking Varuna with a handful of water. Reciting the mantra before sunrise, at noon and after sunset, he was saved from the demon by mantras of great power and spiritual energy.
Description
Menfolk gather at rivers, ponds, or beside wells, for a bath, and then the new yagyopavit is dipped in turmeric and saffron. Japa is done, Gayatri Mantra is recited by the group, Vedas are recited and the old sacred thread is replaced by the new one. Tarpan or prayer is done for the gods and seven great rishis.
The Gayatri Mantra consists of three lines from Rig-Veda (II.62.X), namely:
Om bhur-bhuvah-svah
tat savitur-varenyam
bhargo-devasya dhimahi
dhiyo yo nah prachodayat
(Om).
This has been variously translated, but its general meaning given by Max Muller is as follows: "Let us obtain (or according to Hindu tradition, let us meditate on) the adorable splendour of Savitri (Sun), May he arouses our minds." All Hindu sacred books of later times proclaim these to be the most holy lines of the Vedas. For example, the Manu Samhita the most authoritative of books on sacred law (Dharma Sastra) says:
"Prajapati also milked out of the three Vedas the letters a, u, and ma, together with the words bhuh, bhuvah, svah. Prajapati also milked from each of the three Vedas one of the portions of the text called Savitri, beginning with the word tat...."
The three great imperishable particles preceded by Om and the Gayatri out of over one thousand hymns and 10,500 verses of the Rig-Veda are selected as the supreme credo and prayer for a Hindu. The Gayatri Mantra japa is done during the sacred thread ceremony. It is a part of everyday prayer and japa. It is chanted together at mass prayers and all major events and ceremonies.
"Prajapati also milked out of the three Vedas the letters a, u, and ma, together with the words bhuh, bhuvah, svah. Prajapati also milked from each of the three Vedas one of the portions of the text called Savitri, beginning with the word tat...."
The three great imperishable particles preceded by Om and the Gayatri out of over one thousand hymns and 10,500 verses of the Rig-Veda are selected as the supreme credo and prayer for a Hindu. The Gayatri Mantra japa is done during the sacred thread ceremony. It is a part of everyday prayer and japa. It is chanted together at mass prayers and all major events and ceremonies.

