Most of the people in India think that Ganesh Jayanti and Ganesh Chaturthi are same festivals with different names. The fact is that this not true and there is difference between these two festivals.
In India Ganesh Chaturthi is celebrated and is observed on the fourth day of the first fortnight (Shukla Chaturthi) in the month of Bhaadrapada as per the Hindu Calendar which is generally in August or September in the Gregorian calendar. This festival is celebrated for ten days and ends on the fourteenth day of the fortnight (Anant Chaturdashi).
There are five types of Ganesh Chaturthi:
1. Vinayaka Chaturthi:
After Amavasya or new moon the Vinayaka Chaturthi is observed, i.e. during Shukla Paksha is known as Vinayaka Chaturthi.
2. Angarak Chaturthi:
Angarak Chaturthi is observed every on Tuesday because the Tuesday is the Lord Ganesha’s favourite day, so Angarak Chaturthi is considered as highly auspicious day for their devotee.
3. Maagh Krishna Chaturthi (Also known as Ganesh Jayanti):
On this day devotee offer Ladoos made up of jiggery and with sesame and Naivedya of Til. Devotees of Lord Ganesha’s believed that by worshiping him on Maagh Krishna Chaturthi he takes care of their loved ones whole year.
4. Sankashti Chaturthi :
In English Sankat means problem and Chaturthi means fourth state. It is believed that one can get rid of all his problems if he/she do this fast. Chaturthi which comes after Purnima or full moon and during Krishna Paksha is known as Sankashti Chaturthi or Sankat Chauth.
5. Bhadrapad Krishna:
Bhadrapad Krishna is the most famous and significant Chaturthi from all Chaturthis. It is the Bhadrapad Shuka Paksha Chaturthi and it is considered as the birthday of Lord Ganesha.
The other festival of Lord Ganesh is Ganesh Jayanti and also know the Varad Chaturthi, Magha shukla Chaturthi, and Tilkund Chaturthi. In the state of Maharshtra and Goa Ganesh Jayanti festival is very famous it is held during the shukla paksha Chaturthi on 4th day of the bright fortnight or the waxing moon, in the month of Maagha as per almanac which corresponds to the Gregorian calendar month of January/February. As per holy books of Hindus, Nandi who is the gate- guardian deity of Kailasa (the abode of Lord Shiva), narrated to the Sanatkumara sages that God Krishna was charged with stealing as he saw the moon on Magha shukla Chaturthi, which was prohibited. He observed fast on this day and got rid of the accusation of stealing
These above mentioned festival are the two big festivals of Lord Ganesh. Apart from this, every month two Ganesh Chaturthi are also observed as fasting days by devotees in many parts of India.