The reason for the dawn phenomenon is that

Dawn phenomenon is caused by atmospheric refraction, scattering, Rayleigh scattering and astronomical factors.

Atmospheric refraction: One of the main reasons of dawn phenomenon is atmospheric refraction. Sunlight is refracted when it enters the observer's eyes from the earth's atmosphere. Before sunrise, the sun was below the horizon, but its light had entered the atmosphere.

Atmospheric molecules scatter light weakly, so blue light scatters more, while red light and orange light scatter less. Therefore, when sunlight passes through the atmosphere through a long path, only red light and orange light can penetrate the atmosphere well and reflect to the observer's eyes, forming a red scene at dawn.

Scattering and Rayleigh scattering: At dawn, particles, dust and water vapor in the atmosphere will be scattered. However, the scattering degree of light with different wavelengths in the atmosphere is different. At dawn, blue light is scattered by particles in the atmosphere, while red light and orange light are scattered relatively little. This is one of the reasons why the sky appears red or orange at dawn.

Astronomical factors: Dawn phenomenon is also related to the rotation and revolution of the earth. When the sun rises due to the rotation of the earth, the sunlight passing through the atmosphere is thicker and the light path is longer, so more light waves are affected by scattering, making the sky appear red or orange at dawn. Dawn phenomenon means that the sky appears red or orange before the sun rises.

Dawn phenomenon is the result of the combined action of atmospheric refraction, scattering and earth rotation. Knowing these reasons, we can better appreciate and understand the beautiful scenery at dawn and capture this magnificent scene under appropriate conditions.

The application of dawn phenomenon

Dawn phenomenon is not only caused by atmospheric refraction and scattering, but also related to other phenomena on the earth. Such as weather conditions, temperature, humidity, etc. May have an impact on the dawn phenomenon. In different seasons and regions, the dawn phenomenon will appear differently.

2. The scenery at dawn is a fascinating theme for photographers, and people can take unique photos by using the unique soft light at dawn. Therefore, when shooting the dawn phenomenon, choosing the right shooting position and angle, together with other elements, can create amazing photographic works.