Some regularities of anomalistic and synodic cycles of the motion of the moon

月亮近点周与 会合周的运动规律

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。

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。

For example the determination of the synodic period of Venus the computation of solar eclipses and the commensurability of the Venusian and solar observational periods .

例如，确定金星的 会 和周期，计算日食和金星的公度以及太阳的观测周期。