synodic

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。

it is 9 major planet run the great synodic period in the youngest covering of the fan 180 years.

一百八十年是九大行星运行到最小扇面之内的大会合周期。

its synodic period brings it into conjunction with the sun every 398 days and 88 minutes , a little more than a year

它与太阳关联的会合周期是398天零88分，比一年稍长一些。

It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon.

沙罗周期日数约为朔望月周期（29.53 日）、 交点月周期（27.21 日） 和近点月周期（27.55 日） 的最小公倍数。