In our day-to-day halakhic life, we are accustomed to the fact that "the day begins at night": However, there are areas of Halakha in which the day actually begins in the morning. In the context of the Mikdash, it is clear that the day precedes the night; "a day" begins in the morning and continues until the next morning. How is this possible? Can it be that a day in Halakha sometimes consists of a night followed by a day, and at other times of a day followed by a night? This article examines the practical ramifications of this contradiction, especially pertaining to the commemoration of Pesach and sacrifices.