无论是牛顿力学、还是相对论力学所定义的时间,均属于比较抽象的概念。所幸的是时间的单位:年、月、日、分、秒……规定的通俗易懂。所以,人们在计量时间时才能得心应手、运用自如。正因为如此,人们才能简洁地把地球绕太阳运行一周的时间规定为1年;把地球自转一周的时间定为1天 Neither Newtonian mechanics nor the time defined by relativistic mechanics belong to the more abstract concept. Fortunately, the unit of time: year, month, day, minute, second ...... The provisions of the easy-to-understand. Therefore, when people measure time to be handy, use freely. It is for this reason that people can simply define the period of one week around the sun as one year and one day as one day of the earth’s rotation