1、Prior to A.D. 325, Easter was variously celebrated on different days of the week, including Friday, Saturday, and Sunday. In that year, the Council of Nicaea was convened by emperor Constantine. It issued the Easter Rule which states that Easter shall be celebrated on the first Sunday that occurs after the first full moon on or after the vernal equinox. However, a caveat must be introduced here. The full moon in the rule is the ecclesiastical full moon, which is defined as the fourteenth day of a tabular lunation, where day 1 corresponds to the ecclesiastical New Moon. It does not always occur on the same date as the astronomical full moon. The ecclesiastical vernal equinox is always on March 21. Therefore, Easter must be celebrated on a Sunday between the dates of March 22 and April 25.

　　2、翻譯：在公元325年之前，複活節的慶祝時間可以是一周中不同的時間，而這些時間包括星期五、星期六和星期天。在那些年裡，康斯坦丁大帝組建了尼西亞理事會。這個理事會制定了複活節的标準：複活節應該在第一個滿月後或是春分後的第一個星期進行慶祝。在這裡，我們要作一下解釋。在規定中所指的“滿月”是基督教的滿月，而“滿月”的時間定在陰曆月份的第十四天，那麼，這個月的1号就是基督教的“新月”。由于天文滿月，複活節的日期不會是每年的同一天。另外，基督教的“春分”通常是3月21日。因此，複活節必須在3月22日-4月24日之間的其中一個星期天進行慶祝。

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