While offering gifts, taking a purificatory bath and the like we have to note the lunar day (tithi) at the time of sunrise on that day. It is ordaincd that a Sanyasi (a Bhikshu or a mendicant) should have his food during the last one-eighth part of the day, and that he should not cat at night. A widow also has to observe the same rule. On the Parva days, the widow should not take even water; shc may take fruits, but not cooked food at night.