adverb taking the 'to' particle, adverb, noun or participle which takes 'suru'
Describes something clear, bright, or fresh, often used for the sky, moonlight, or a crisp, clear state. Commonly used as an adverb with と or as a する-verb.
今夜は月が冴え冴えと輝いている。
Tonight the moon is shining brightly and clearly.
空
The air is crisp and fresh, and it feels good.