The date of Ganesh Chaturthi falls on the fourth day after the new moon in the Hindu month of Bhadrapada. This is August or September each year. Its commonly celebrated for 11 days, with the biggest spectacle taking place on the last day called Ananta Chaturdasi.
Ganesh Chaturthi is celebrated as birth anniversary of Lord Ganesh. On Ganesh Chaturthi, Lord Ganesh is worshipped as the god of wisdom, prosperity and good fortune. It is believed that Lord Ganesh was born during Shukla Paksha of Bhadrapada month. Currently Ganesh Chaturthi day falls in month of August or September in English calendar.
The Ganeshotsav, the festivity of Ganesh Chaturthi, ends after 10 days on Anant Chaturdashi which is also known as Ganesh Visarjan day. On Anant Chaturdashi, devotees immerse idol of Lord Ganesh in water body after a gala street procession.
Ganesh Puja is preferred during Madhyahana as it is believed that Lord Ganesh was born during Madhyahana Kaal. Madhyahana Kaal is equivalent to midday according to Hindu division of the day.