The word guru is not a title, it is a description. It comes from two Sanskrit roots: gu, meaning darkness, and ru, meaning the one who dispels it. A guru is simply whoever removed some darkness for you. On the full moon of Ashadh we stop and face that person.
The day is also called Vyasa Purnima, because it marks the birth of Ved Vyasa. He took the mass of Vedic hymns and divided it into four, the Rig, Yajur, Sama and Atharva, then handed one to each of four chief disciples so it would survive. He also gave us the Mahabharata. He is honoured on this day as the teacher every later teacher stands on.
It is not only a Hindu day. The Buddha gave his first sermon at Sarnath on this same full moon, and in Jain tradition it is the day Mahavira took Gautam Swami as his first disciple. Three paths, one idea: everything worth knowing reached you through somebody.
The timing is practical, not only poetic. With the monsoon settling in, sadhus and Jain munis stop travelling and stay in one place for the four months of Chaturmas. A teacher who has been walking all year is suddenly sitting still and teaching. So this is the full moon when the guru is actually within reach, and disciples go to him rather than wait for him to pass through.
Gujarat has a particular reason to hold this day close. The Swaminarayan Sampraday was born here, and in it the guru is not an idea but a person you sit in front of, so Guru Purnima is one of its biggest days: disciples perform their guru's puja and aarti, the same way the Lord is worshipped. Kalupur in Ahmedabad, the first mandir Swaminarayan built, fills up. Gujarat's Jain families keep the same day for their munis, who are just then settling in for Chaturmas.
Guru Purnima 2026 falls on Wednesday, 29 July. It is fixed by the tithi rather than the English calendar: it is always the Purnima, the full moon, of Ashadh, which is why the date moves every year.
Because it marks the birth of Ved Vyasa. He divided the Vedic hymns into the Rig, Yajur, Sama and Atharva and taught them to four chief disciples, and he gave us the Mahabharata. Honouring the guru on his birthday is the point: he is the teacher the later teachers came from.
It comes from two roots: gu, darkness, and ru, the one who dispels it. So a guru is not defined by robes or a title but by a simple test: did this person remove some darkness for you?
Then the day is still yours. Honour Ved Vyasa, whom the day is named for, and honour the people who taught you without the title: a schoolteacher, a parent, the person who trained you at your first job. The gratitude is the ritual.
No, it is not a vrat. There is no fasting rule and no parana. It is a day of puja and gratitude: go to your guru, do the padapuja, offer dakshina, and keep the food and the mind simple.
It is one of the big days for the Swaminarayan Sampraday, which began in Gujarat and puts a living guru at the centre, so disciples perform their guru's puja and aarti; Kalupur in Ahmedabad, the first mandir Swaminarayan built, fills up. Gujarat's Jain families venerate their munis on the same day, as the munis settle in for Chaturmas.