Correct

西沉

/ xī chēn / 
Strokes

Definition

(of the sun) to set

Example

As a Verb

(of the sun) verge towards the horizon

1
Rì
日
yǐ
已
xīchēn
西沉
  
。

The sun has set.

2
Xīyáng
夕阳
xī
西
chēn
沉
  
。

The evening sun is sinking towards the horizon. / The sun is setting in the west.

3
Xī
西
chēn
沉
de
的
tàiyang
太阳

westering sun