This is the 8181st most frequent Russian word.
луной
The Russian word "луной" means "by the moon" or "moon" in the instrumental case.
In this sentence, 'луной' is used in instrumental case, indicating that 'луной' refers to the object being admired, specifically the moon.
Она любуется луной в ясную ночь.
She admires the moon on a clear night.
Here, 'луной' is instrumental, showing the moon as the source of illumination.
Путник шел, освещаемый луной.
The traveler walked, illuminated by the moon.
In this example, 'луной' describes the quality of beauty as influenced by the moonlight.