What kind of picture does the first eight sentences of Twelve Miscellaneous Poems depict?

Sunset in the western hills, white moon rising in Dongling. The moon is far away from Wan Li, radiating brilliance, and the mighty night sky is very bright. The wind blows into the house, and the night is cold. The climate has changed, and I know that the season has changed. I can't sleep, and I know that the night is long.

Starting from four sentences, it opens a realm of infinite expansion of light, which is actually the embodiment of profound understanding. The author of the last four sentences realized the change of seasons because of the climate change, and realized the long night because he couldn't sleep. All these strong feelings imply the poet's deep sadness.