night of the 15th day of the first lunar month
Refers to the night of the first full moon of the lunar year, associated with the Lantern Festival (元宵節). Used in cultural or historical contexts.
On the night of the 15th day of the first lunar month, people celebrate by displaying lanterns.
Lantern Festival
From Chinese 元宵 (yuánxiāo), referring to the night of the first full moon of the lunar year.