太阳和月球对于地球的最大影响之一就是潮水,潮水每天升降两次,对于住在海滨或航海的人来说,除了昼夜和四季以外,与日常生活关系最密切的自然现象就是潮水了。两次高潮中间相隔12小时30分钟,更准确些,两次相对应的高潮中间的时间平均相距24小时51分钟。这个时间与月球两次通过一个地方的子午线所需的平均时间恰好相等。这说明 One of the biggest impacts of the sun and the moon on the earth is the tide. The tide rises and falls twice a day. For people living on the waterfront or sailing, in addition to day and night and the four seasons, the natural phenomenon most closely related to daily life is the tide. The interval between the two climaxes is 12 hours and 30 minutes. More accurately, the time between two corresponding climaxes is on average 24 hours and 51 minutes apart. This time is exactly the same as the average time required for the moon to pass twice through a place’s meridian. this means