Correct

天平动

/ tiānpíng dòng / 
Strokes

Definition

(astronomy) libration

Example

As a Noun

libration

1
Tiānpíng
天平
dòng
动
guǐdào
轨道

libration orbit

2
Tiānpíng
天平
dòngdiǎn
动点

libration point