What does "the morning glow fills the sky, the scorching sun shines in your head, and the sun sets in the west" mean?

The sky is filled with morning glow: The sky is filled with red glow in the morning.

The scorching sun: The scorching sun hangs high in the sky, which is a metaphor for the hot weather.

Sunset: The sun sets to the west at dusk.

Represent three different sky scenes in the morning, noon, and sunset.

For example: the sky is full of morning glow, the rising sun is rising in the east, the sun is at the zenith, the setting sun is setting in the west, and the third watch in the middle of the night just describes the different changes of the sun in the sky throughout the day.