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Convert the following poem into a scientific report.

Input:
The sun sets behind the mountains,
Casting a golden glow across the land,
A peaceful tranquility descends,
As creatures of the night take their stand.
gpt
The sun's descent below the horizon produces a yellowish-orange light that illuminates the land in a discontinuous manner. This event initiates a state of quiescence as nocturnal animals awaken and start their activities.