晨昏蒙影 meaning in English

morning and evening twilight
twilight

There is the time of the summer solstice an astronomical twilight lasting throughout the whole night .
夏至时天文晨昏蒙影持续整夜。
The phenomenon of twilight is a consequence of the scattering of the light in the atmosphere .
晨昏蒙影现象是光在大气中散射的结果。
If the sky is cloudy the duration of the real twilight is of course considerably shorter .
如果天空多云，那么实际的晨昏蒙影时间是相当短的了。