太陽が沈んで

the sun sets and

→ 太陽
phrase Rare #27,300
the sun sets and 沈んで is the te-form of 沈む (to set). It connects to what follows and can also mean “after the sun sets,” depending on context.
JA: 太陽が沈んで、星が見え始めた。
EN: The sun set, and the stars began to appear.

太陽が沈んでからやっと子供も家に帰った。

The child finally came home after the sun had set.

しばらくすると、太陽が沈んで暗くなりました。

After a while, the sun went down and it got dark.

太陽が沈んでいく。

The sun is setting.

太陽が沈んで

As the sun sets...

— Cosmic Princess Kaguya! (2026)