From which ancient poem do "April Green" and "Rain clears up" come from?

From Sima Guang's Early Summer among Guests in the Song Dynasty

Original text:

In April of early summer, the weather was sunny and warm, and it cleared up after a rain. After the rain, the mountains were greener and more pleasant, and the mountains in the south became clearer.

There are no catkins in the wind, only sunflowers open to the sun.

Translation:

In early summer and April, the weather was sunny and warm, and it cleared up just after a day of rain. After the rain, the mountains are greener and more pleasant, and the Nanshan across the street is clearer. There are no catkins fluttering in the wind, only sunflowers blooming towards the sun.

Precautions:

(1) Guest: Living in a foreign country is a guest.

⑵ Harmony: The weather is sunny and warm.

(3) Nanshan Danghu: Nanshan, opposite the door.

(4) only: only, only.

Living in my hometown, in late spring and early summer, a beautiful, clear and warm picture after the rain jumped into the poet's field of vision. In this changing picture, the poet doesn't like the rainy Nanshan, nor does he praise the catkins dancing with the wind, but gives his unique bell to the sunflower diagonally facing the sun. What's the point? It is not difficult to find that the poet does not love sunflowers alone, but because of his temperament. The poet has been in the officialdom for a long time, which is what he means. However, in any case, I don't want to "bow my head and raise my eyebrows" and sway with the wind. I finally chose to be a sunflower growing towards the sun. Really golden, smiling, knowing how to cherish the sunshine. Maybe this is the loveliness of sunflower!