Angaark means Planet Mars and he is the son of Bharadwaj Rishi and Mother Earth. He prayed to Lord Ganesh for blessings. The Lord Ganesh impressed for Angaark and came to his front on Sankashti Chaturthi(the day was tuesday) and blessed him. The Angaark is asked to Lord Ganesh that was to be with allied with Your’s name forever.
The Lord Ganesh is accepted his apologies and proclaimed that who do fasting on this Angaark Chaturthi day they get success in life. From that onwards Sankaahti Chaturthi is known as Angaark Chaturthi.