The day when he left was the ninth day of the first lunar month.
他离开的那天是阴历正月初九。
The night of the 15th day of the first lunar month marks the beginning of the first full moon.
正月十五的晚上意味着第一个满月的开始。
The Lantern Festival is on the 15th day of the first lunar month, it has a Chinese name Yuanxiao Festival.
“灯节”在农历正月十五,其中文名字叫元宵节。
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