“新年好!”“Happy new year!”……每当元旦来临的时候,到处呈现出一派热闹欢快的场面,人们的脸上洋溢着节日的光彩。大约在公元前五万年左右,古埃及人已由游牧改为农耕,定居在尼罗河(图1,埃及)两岸。古埃及人从长期的观察中发现,与他们的农业收成有很大关系的尼罗河泛滥的现象是有规律 Happy new year! "... Every New Year is coming, a group of lively and joyful scenes are presented everywhere, and people’s faces are full of festivals. About 50,000 BC or so, the ancient Egyptians changed from nomadic to farming and settled on both sides of the Nile (Figure 1, Egypt). From the long-term observation, the ancient Egyptians found that the phenomenon of flooding of the Nile, which has a great relationship with their agricultural harvest, is a regular phenomenon