Observed on Ashadha Shukla 15th.
The tithi window is the period during which this festival's defining lunar phase is active. Times are in Shimabara local clock.
Guru Purnima is one of the festivals observed in the Hindu calendar. A detailed account of its mythology, significance, and rituals is being prepared.
Computed for Shimabara (Asia/Tokyo) using local sunrise, sunset and astronomical positions.
Other observances and vrats falling in July 2026, with dates computed for Shimabara.
A more detailed account of Guru Purnima — its mythology, regional variations, and rituals — is being prepared.