Ganesh Chathurthi and Moon

Ganesha riding on his mount, mouse.It is said that one day Ganesha, after having received from many of his devotees an enormous amount of sweets (Modak), in order to better digest this incredible mass of food, decided to go for a ride. He got on the mouse which he used as his vehicle and took off. It was a magnificent night and the moon was resplendent. Suddenly a snake appeared out of nowhere and nearly frightened the mouse to death, causing it to jump and Ganesha was thrown off his mount. Ganesha's huge stomach smashed against the ground so forcefully that it burst open and all of the sweets that he had eaten were scattered around him. Nonetheless, he was too intelligent to get angry about this accident and, without wasting any time in useless lamentations, he tried to remedy the situation as best he could. He took the serpent which had caused the accident and used it as a belt to keep his stomach closed and bandage the injury. Satisfied by this solution, he remounted his mouse and continued his excursion. Chandradev (Moon God) saw the whole scene and laughed. Ganesha, being the short-tempered one, cursed Chandradev for his arrogance and breaking off one of his tusks, hurled it against the Moon, slashing its luminous face in two. He then cursed it, decreeing that anyone who happens to see the moon will incur bad luck. Hearing this, Chandradev realised his folly and asked for forgiveness from Ganesha. Ganesha relented and since a curse cannot be revoked, only softened it. Ganesha softened his curse such that the moon would wax and wane in intensity every fifteen days and anyone who looks at the moon during Ganesh Chaturthi would incur bad-luck. This explains why, in certain moments, the light of the Moon goes off and then begins gradually to reappear; but its face appears whole only for a brief period of time, since it is once again "broken" in half to the point of disappearing.