Buddha Pūrṇimā · Vesak · Vaiśākha's full Moon
What is Buddha Pūrṇimā / Vesak?
Buddha Pūrṇimā, also called Vesak or Buddha Jayantī in India, is a major Buddhist full-moon observance. It remembers the Buddha's birth, awakening, and parinirvāṇa and centers wisdom, compassion, generosity, and the practice of Dhamma.

A sacred Buddhist full-moon observance
Communities honor the Buddha through practice and generosity.
Participation varies among Buddhist traditions. Communities may visit a vihāra or stūpa, listen to Dhamma teachings, meditate, chant, offer flowers or lamps, support people in need, and renew commitments to compassionate conduct.
The illustration brings together widely recognized symbols: the Bodhi tree recalls awakening, the dharmacakra represents the teaching of Dhamma, the lotus suggests awakening, and the full moon marks the calendar connection.
The Indian calendar connection
Buddha Pūrṇimā falls on Vaiśākha Śukla Pūrṇimā.
The lunar month used for this Indian observance rule.
The bright, waxing half of the lunar month.
A widely used name for the observance across Buddhist communities.
Buddhist calendars and community authorities apply their own traditions when assigning Vesak. Open Pañcāṅga uses an Indian Vaiśākha full-moon reference.
Why it appears
The report checks for Vaiśākha Pūrṇimā at local sunrise.
The rule identifies Buddha Pūrṇimā / Vesak when Pūrṇimā is underway at sūryodaya, local sunrise, during the regular lunar month Vaiśākha in the named amānta calendar method.
The exact Full Moon is an astronomical instant. The observance date comes from the local tithi, sunrise, lunar month, and calendar method.
Official references: Incredible India, Buddha Pūrṇimā · Press Information Bureau, India's Buddhist Heritage