像埃及这样的古代文明面临的挑战之一是计时，也就是日历。
One of the challenges that faced ancient civilizations like Egypt was timekeeping, calendars.
早在数千年前，古代中国、希腊和其它很多古代文明就发明了各种各样的精确计时仪器。
Various types of instruments to accurately measure the passage of time were invented in ancient China, Greece, and other civilizations thousands of years ago.
水钟，亦称漏壶，利用水的流动计时的古代时钟。
Water clock: or clepsydra, Ancient device for measuring time by the gradual flow of water.
天干地支与十二生肖，是中国古代历法研究的成果，一般来说，十二生肖用于记年，天干地支计时。
Heavenly Stems, Earthly Branches and the Twelve Animal signs(shengxiaos)are brainchild of Chinese ancestors. Generally, the former are used in calculating hours while the latter numbering years.
收集并核查了中国古代34条最长计时单位为“夜”的计时月掩行星资料的日期和天象。
All the 34 timing records with the length no more than one night, of lunar occultations of the Planets are collected and their dates and descriptions for celestial phenomena are checked.
收集并核查了中国古代34条最长计时单位为“夜”的计时月掩行星资料的日期和天象。
All the 34 timing records with the length no more than one night, of lunar occultations of the Planets are collected and their dates and descriptions for celestial phenomena are checked.
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