My video was shot in the early morning of August 13th, 2019,Beijing,China. This 8-second timelape video recorded the changes in the sky for about 30 minutes. Vega, the brightest star in the sky, slowly disappeared, and the sky gradually brightened. Throughout the process, you can also see the changes in the clouds. In the video, there are two layers of clouds, the low-level clouds moving forward, and high-level clouds moving backwards. The two layers of clouds are moving in opposite direction.