Moon rise today is at 21:15. Chaturdhi starts at 18:18 and runs till 16:08 on May 9th , tomorrow.
Morning after bath Ganapathi mantra " Om Gam Ganapataye Namah" is to be chanted for 108 times. Fasting should be done. In the evening Ganesha Shodasopachara pooja has to be done and nivedan of Modak, Jaggery has to be done. Ganesha has to be worshipped with Bilva patra. Offering 21 modaks in nivedan along with other items will give good results. After the pooja again chanting " Om Gam Ganapataye Namah" has to be done.
For Others who do not observe the Vrat : Today is a very good day to start doing Japa to Ketu graha. Performing Ganesha Homa will result in immense auspicious benefits. Chanting any Ganesha stotra is good.