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我们通常使用的历法上的时间单位有四个:年、月、日和星期。年、月、日分别是与我们人类关系最密切的天体(太阳、月球和地球)运动或视运动的一种周期。年是太阳在黄道上作视运动、两次过春分点周期;月是根据月亮与地球相互绕转运动的朔望月的平均值(阴历月和农历月)或根据年的长度划分的平均值(阳历月);日是地球自转的一个周期、平太阳日确定的。三个时间单位每个都有其明确的天体物理含义。只有星
There are four time units that we usually use for calendar: year, month, day, and day of the week. Year, month and day are respectively the cycles of movement or visual movement of celestial bodies (the sun, the moon and the earth) most closely related to our human beings. The year is the sun as the zodiac acting as the movement, the two points of the spring break points; Moon is based on moon and Earth orbiting movement of the average lunar month (lunar month and lunar month) or according to the length of the year divided by the average (solar calendar month The day is a period of the Earth's rotation, as determined by the sun's rays. Each of the three time units has its own clear astrophysical implications. Only stars