Meaning: The sun was setting and the day was ending.
Choice of Words: Sun: the star at the center of the solar system. Set: go down below the horizon at the end of the day. Day: the period of light between sunrise and sunset.
Alternative Expressions
As the sun sank below the horizon, the day drew to a close.
Meaning: This sentence means that the sun has set and the day is ending.
Choice of Words: The horizon is the line where the sky meets the land or sea. When the sun sinks below the horizon, it means that it is setting. The word "drew" means to come to an end.
With the sun's descent, the day concluded.
Meaning: This sentence means that the sun has set and the day is over.
Choice of Words: The word "descent" means to move downwards. When the sun descends, it means that it is setting. The word "concluded" means to come to an end.