Rig Vedic Upakarna is observed on the day of Shravana nakshatra in the sukla paksha in the Shraavana month (waxing moon period). Regardless of whether it is a full moon day (purnima) or not, Rig Vedic Brahmins replace the holy thread on that day.
Avani Avittam, also known as ‘Upakramam,' signifies start of the study of the Vedas and is a major ceremony for the Brahmin community in Kerala (Malayalam: ആവണി അവിട്ടം) and Tamil Nadu (Tamil: ஆவணி அவிட்டம்). It falls on the traditional Hindu calendar's Shravan Purnima (full moon day), which is also Raksha Bandhan Day in North India.
The Tamil month of Avani is Avittam, which is one of the 27 Nakshatras. The Avani Avittam ceremony is observed with complete dedication and devotion by Brahmin communities all across the world. On this day, the Yajur Vedic Brahmins begin reading the Yajur Veda for the next six months.
Brahmins basically are given a sacred thread on Avani Avittam, and it mostly is thought that the third eye (eye of knowledge) opens. Avani Avittam, also known as ‘Janeyu Purnima’ or ‘Jandhyala Purnima’, actually is a Hindu very festival observed with sort of great fervour in Orissa, Maharashtra, and the southern regions of India. Rigveda Upakarma, according to Nirnaya Sindhu, should for all intents and purposes be performed on a day in shravana, when shravana is the star, and lasts at sort of the least from sunrise to midday in a generally big way. If you're in Uttara Ashadha during sunrise, though, you won't definitely be able to actually see it.
Rituals During Avani Avittam
A holy vow, known as Mahasankalpam, is taken on Avani Avittam to atone for sins done in the previous year. During this time, sacred mantras are recited.
Rigveda In Sanskrit, upakarma signifies "beginning." It is a vedic rite that is mainly performed by Brahmins in India's southern states. This ceremony is also performed by Kshatriyas and Vaishyas.
Upakarma is observed once a year in month of Shravana. The Brahmins replace their Yajnapavit or Upanayana thread on this auspicious day, which is followed by mantra chanting or Srauta ceremonies. The whole Rig, Yajur, and Sama vedic Brahmins then follow suit.
Gayatri Japa Sankalpam is the next day of this commemoration. The Upakarma is performed in Shravana month, according to the ancient Hindu calendar, under the Dhanistha or Avittam nakshatra. In Tamil Nadu, this is known as Avani Avittam.