Poetry about the darkness before dawn 1. pre-dawn darkness
This must start with the characteristics and laws of the reflection and scattering of solar light by the earth's atmosphere. According to atmospheric science research, at night, the sky is in a dark state because there is no direct sunlight. If there is still a faint light, it is because air molecules or tiny particles in the atmosphere reflect and scatter sunlight. The intensity of this reflection and scattering is closely related to the height of the intersection angle between the earth and the sun, that is, the higher the intersection angle, the stronger the reflection and scattering, and the less dark the sky; On the contrary, the smaller the intersection angle, the weaker the reflection and scattering of light, and the darker the sky. As we all know, the angle between the earth and the sun rays is the lowest in the two periods after sunset and before dawn, and the reflection and scattering of the sun rays by the atmosphere in these two periods are the weakest, so it is the darkest period. On the contrary, in the middle of the night, due to the large angle between the earth and the sunlight, the atmosphere has a relatively strong reflection and scattering effect on the sunlight, so even in the middle of the night, the sky does not necessarily look dark. It goes without saying that from the darkness of midnight to the darkness before dawn, there is a feeling of darkness before dawn.
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