The fourth moon (Charturthi) is associated with Ganesha. The fourthday of the waxing moon is called Vinayaka chaturthi. Worshipping Ganesha on this day is auspicious & brings success. The Vinayaka chaturthi which falls in the half of August-September is most auspicious as it comes after the monssons when the earth is green filled with new vegetation. The Vinayaka Chaturthi which falls in the bright half of Magh (January-February) is also celebrated in some parts of India as Ganesh Jayanti. This fourth day of the waning moon is known as Sankashti chaturthi. If Sankashri chaturthi falls on Tuesday, it is called Angarika Chaturthi and is also auspicious. Vinayaka Chaturthi is celebrated as a big festival in the city of Mumbai, Inida. The Ganesha idols are installed in every house & locality and pooja is conducted with great devotion & decoration. Then the idol is immersed in sea. The idol immersion process is called Visiorjan in Mumbai. All of India celebrates Ganesh Chaturthi in a great grand way. The Ganesh idols are made mostly of plaster of paris & clay and are average of 5 to 6 feet height. Each image will be different from the other.