自转的地球

2020 July 1

Our Rotating Earth
Video Credit & Copyright: Bartosz Wojczyński

Explanation: Has your world ever turned upside-down? It would happen every day if you stay fixed to the stars. Most time-lapse videos of the night sky show the stars and sky moving above a steady Earth. Here, however, the camera has been forced to rotate so that the stars remain fixed, and the Earth rotates around them. The movie, with each hour is compressed to a second, dramatically demonstrates the daily rotation of the Earth, called diurnal motion. The video begins by showing an open field in Namibia, Africa, on a clear day, last year. Shadows shift as the Earth turns, the shadow of the Earth rises into the sky, the Belt of Venus momentarily appears, and then day turns into night. The majestic band of our Milky Way Galaxy stretches across the night sky, while sunlight-reflecting, Earth-orbiting satellites zoom by. In the night sky, you can even spot the Large and Small Magellanic Clouds. The video shows a sky visible from Earth’s Southern Hemisphere, but a similar video could be made for every middle latitude on our blue planet.

Almost Hyperspace: Random APOD Generator

Tomorrow’s picture: open space

自转的地球
视频提供和版权：Bartosz Wojczyński

说明：你的世界曾上下倒悬吗？如果你以恒星为定锚的话，这种现象每天都会出现。在大多数呈现夜空的缩时视频里，恒星和天空绕着不动的地球打转。不过在拍摄这部影片时，相机强制旋转，让恒星保持固定而地球在回旋。这部影片经过压缩，1秒代表实际上的1个小时，以明确展现称为周日运动的地球自转。在这部影片的开头时，可见到摄于去年的一个晴天下，非洲纳米比亚的一片原野。随着地球回旋，地球的影子升向天空，金星带也短暂出现，接着白画就化为黑夜。在黑夜里，银河系壮丽的中央盘面贯过天空，而在阳光中熠熠生辉的地球轨道卫星飞掠而过。此外，在夜空中，还可见到大与小麦哲伦星系。虽然这部影片呈现南半球的天空，但任何地球中纬度的地点，都能拍到类似的影片。

几近多维空间：随机APOD生成器

明日的图片：open space