Shani Amavasya, occurring twice this year in March and December, is an important Hindu ritual where ancestors and Shani Dev are worshipped. As an inauspicious day, it is believed to have a powerful negative energy, making it crucial for performing puja, donating food, and observing fast to get rid of ill effects caused by Saturn. It is also a time for Tarpan and Shradh to honor deceased ancestors and bring peace to their souls. This year's Shani Amavasya falls on March 13 and marks the last Amavasya of the Hindu calendar month Phalgun.