一、关于“白夜”的界定在纬度较高地区的夏季,晨昏蒙影持续的时间往往很长,以至于前一天的昏影尚未结束,后一天的晨光已经开始,从而使整个夜间天空都是明亮的,这种情况称为“白夜”。关于白夜,不同的书上界定的标准是不同 I. About the definition of “white night” In the summer of high latitudes, the time of morning twilight and shadow is often very long, so that the day before the dim shadow has not yet ended, the day after the dawn has begun, so that the entire night sky is Bright, this condition is called “White Night.” About the White Night, the standards defined in different books are different