What does the first day of the lunar hook mean?

At night, the moon rises, and Wei Zihua looks particularly beautiful in the moonlight.

The poem "The Moon Hooks at the Beginning of Wei Zi Hua" comes from Go Straight by Zhou Bida, a poet in the Song Dynasty. "On the first day of the first month, crape myrtle blossoms" is a poem describing the night scene. Among them, "moon hook" refers to the arc when the moon rises, just like a hook; Wei Zihua is a beautiful flower, symbolizing nobility and elegance.

The whole poem means: at night, the moon has just risen, and the curved crescent moon hangs in the air like a hook. At this time, crape myrtle is more beautiful and noble in the moonlight.