Buddha Purnima during Vaishakha month is celebrated as birth anniversary of Gautama Buddha. Gautama Buddha whose birth name was Siddhartha Gautama was a spiritual teacher on whose teachings Buddhism was founded.
The time of Gautama Buddha's birth and death is uncertain. However, most historians date his lifetime between 563-483 B.C. Most people consider Lumbini, Nepal as birth place of Buddha. Buddha died at the age of 80 at Kushinagar, Uttar Pradesh.
For Buddhists, Bodh Gaya is the most important pilgrimage site related to the life of Gautama Buddha. The other three important pilgrimage sites are Kushinagar, Lumbini, and Sarnath. It is believed that Gautama Buddha obtained Enlightenment at Bodhagaya and he first taught the Dharma at Sarnath.
It is believed that Gautama Buddha obtained Enlightenment on this day. Buddha Purnima is also known as Buddha Jayanti, Vesak, Vaishaka and Buddha's Birthday.
In North India Buddha is considered as the 9th incarnation and Lord Krishna as the 8th incarnation of Lord Vishnu. However, Buddha is never considered as an Avatar of Vishnu in South Indian belief. In South India, Balarama is considered as the 8th incarnation and Krishna as the 9th incarnation of Lord Vishnu. Balarama is counted as an incarnation of Vishnu by the majority of Vaishnava movements. Even Buddhists do not consider Buddha as an incarnation of Lord Vishnu.