Why is the Moon central to Karwa Chauth celebrations?

Karwa Chauth coincides with Sankashti Chaturthi, a fasting day dedicated to Lord Ganesha. The Moon is considered a symbol of prosperity and well-being, and its sighting marks the end of fast. Women offer water to the Moon using an earthen pot, then offer food to the Moon before sharing it with their husbands, seeking blessings for marital happiness and prosperity.