以7天为一个星期的记日方法由来已久,早在公元前古罗马就开始使用了,逐渐为世界上绝大部分国家所采用。这种记日方法是根据月相变化来确定的。古罗马人发现,月亮有着明显的圆缺变化,而“朔”、“上弦”、“望”、“下弦”之间都是7天左右,于是他们就把月相每一变化作为一个周期,产生出7天为一周期的记日法。后来,人们又把这7天与金、木、水、火、土、月、日7个星宿对应起来,7天中的每一天为一个星的日期,这就是“星期”的由来。 The seven-day-old method of chronology has a long history. Ancient Rome was used as early as BC and gradually adopted by most countries in the world. This method of remembering the sun is based on changes in the moon phase. The ancient Romans found that the moon had a marked change in the radius of the moon, and the moon, the moon, the moon, the moon, Produce a seven-day cycle of the Japanese law. Later, people again put these seven days and gold, wood, water, fire, earth, month, day seven stars corresponding to each day in seven days as a star date, and this is the origin of the “week.”