synodic

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大周期。

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

它与太阳关联周期是398天零88分，比一年稍长一些。