I have heard one story about chouth ka chand. don't know if its true or not.....
once when Ganapati Bappa was going somewhere using sky way (sitting on the mouse his vehicle symbol) Chandrama started laughing at Ganapati. When Ganeshji asked him reason for his laughter, he said that he cant stop laughing looking at huge Ganesha sitting on small mouse.....
So, Ganeshji gave him Shrap that on Chouth day of month whoever will see him will be punished by God.
Then Chandrama begged for forgiving him and Ganeshji gave him one Vaardaan that on Chouth if any one will fast entire day and will see Chand at night before eating will not be punished by God.
ok..... hope you understood the story . I know I am not a good story writer.
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cheers,
prithvika