synodic month
- 网络朔望月
synodic month-
Selection of the Constant of Synodic Month in Ancient Chinese Calendars
中国古代历法中之朔望月常数的选择
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There are two kinds of almanac both in Historical Record Almanac and Record Of Han Almanac which have the same start-point but the synodic month and the average of period different .
《史记·历书》和《汉书·律历志》分别记载了具有同一起算点，但朔望月与回归年平均值不同的两种历。
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It is shown that a tropical year was 405 days and a synodic month was 31 days about 5 × 10 8 a ago , which coincide with the paleontological data , and the " Gerstenkorn event " can never occur .
理论给出在5×108a以前，地球回归年有405d，朔望月有31d，也与古生物学数据相符。