In 2026, Ganesh Chaturthi will be observed on Monday, September 14. The festival falls on the Chaturthi tithi of Shukla Paksha in the Hindu month of Bhadrapada, which traditionally marks the birth of Lord Ganesha. The duration of celebrations varies by household and region. Some devotees observe the festival for one and a half days, while others continue for five, seven or ten days, concluding with Ganesh Visarjan.According to Hindu timekeeping, the day is divided into five parts between sunrise and sunset: Pratahkala, Sangava, Madhyahna, Aparahna and Sayankal. Ganapati Sthapana and Shodashopachara Ganapati Puja are ideally performed during Madhyahna, making it the most preferred window for worship. Ganesh Chaturthi 2026: Moon Sighting Restriction And Mithya Dosha A significant belief associated with Ganesh Chaturthi is the prohibition against moon sighting on this day. It is said that seeing the moon during Chaturthi leads to Mithya Dosha or Mithya Kalank, meaning false accusation or undeserved blame. Ganesh Chaturthi Vrat Katha and the Syamantaka Mani story The origin of this belief is explained through the Ganesh Chaturthi Vrat Katha, narrated by Lord Shiva and later elaborated by Sage Narada. The story centres on Lord Krishna and the Syamantaka Mani, a divine jewel bestowed by Surya, the Sun god, upon Satrajit. The jewel produced gold daily but carried strict conditions of purity for its wearer.When Satrajit’s brother Prasenajit wore the jewel in an impure state, he was killed by a lion during a hunt. Krishna returned to Dwaraka without Prasenajit, leading to suspicion and false accusations against Him. Though Krishna later recovered the jewel from Jambavant and returned it, the allegations continued, even causing discord with His brother Balarama. Distressed by repeated slander, Krishna sought guidance from Sage Narada, who explained that the cause lay in Krishna having seen the moon on Bhadrapada Shukla Chaturthi. Narada revealed that Lord Ganesha had once cursed Chandra, the Moon god, for mocking His appearance. Ganesha declared that anyone who looked at the moon on this day would suffer false accusations. Narada advised Krishna to observe the Ganesh Chaturthi fast and worship Lord Ganesha with devotion. Krishna followed the prescribed vrat and rituals, after which the false accusations against Him were resolved. The story is cited as the reason devotees observe the vrat, avoid moon sighting, and recite the Vrat Katha on Ganesh Chaturthi.