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时间是天体运动变化的标志:地球绕太阳公转一周为一年;月亮圆缺一个周期为一个阴历月,公历一个月则是地球公转一周的1/12左右;地球自转一周为一天,太阳处在上中天为12时,在下中天为零时。随着时间的变化,自然界的温度、空气中的含氧量、来自空间的微粒辐射、地球的磁场强度等,也都随之变化;人类在适应自然界这些变化的同时,人体
Time is a sign of changes in the celestial movement: the earth revolves around the sun for one year; the moon is missing for a period of one lunar month; the calendar month is about 1/12 of the earth’s revolution; the earth rotates for one day and the sun is on On the transit of 12, when the next transit is zero. With the change of time, the temperature in nature, the oxygen content in the air, the particle radiation from the space, the magnetic field strength of the earth also all change along with it. While humans are adapting to these changes in nature,