The day of full moon, Purnima, in the month of Ashadh of the Hindu calendar is traditionally celebrated by Hindus as Guru Pūrṇimā. On this day, devotees offer puja (worship) to their Guru.
Guru Purnima (IAST: Guru Pūrṇimā) is an Indian festival dedicated to spiritual and academic teachers. This festival is traditionally celebrated by Hindus, Jains and Buddhists, to pay their respects to their teachers and express their gratitude. The festival is celebrated on the full moon day (Purnima) in the month of Ashadh (June–July) of the Shaka Samvat, which is the Indian national calendar and the Hindu calendar.