哥白尼环形山的日出
影像来源与版权:Sage Gray

说明:哥白尼环形山是月球风暴洋上的一个著名撞击点,它位于这幅望远镜光影影像的中央。在这幅拍摄于4月14日凌晨3点30分、由多张照片叠加而成的清晰视频影像中,月球的明暗界线(昼夜分界线)从直径为93公里的环形山中央切过。阳光刚刚开始照射到它高大的西墙上,但还没有照射到附近较低的地带,短暂地将环形山的轮廓延伸到月球背面。在那一刻,如果你站在哥白尼环形山上,你可以看到日出,这是哥白尼环形山每29.5天发生一次的事件。当然,这相当于一个太阴月或望朔月,也就是从地球上看到的连续满月之间的时间。
翻译:北京天文馆

Sunrise at Copernicus Crater
Image Credit & Copyright: Sage Gray

Explanation: A prominent impact site anchored in the lunar Oceanus Procellarum, Copernicus crater is at the center of this telescopic portrait in light and shadow. Caught in stacked and sharpened video frames recorded on April 14 at 3:30am UTC, the lunar terminator, or boundary between night and day, cuts across the middle of the 93 kilometer diameter crater. Sunlight is just beginning to strike its tall western walls but doesn’t yet shine on lower terrain nearby, briefly extending the crater’s outline into the lunar nightside. At that moment standing at Copernicus crater you could watch the sunrise, an event that happens at Copernicus every 29.5 days. Of course that corresponds to a lunar month or a lunation, the time between consecutive Full Moons as seen from planet Earth.
Astronomy Picture of the Day 05/30/2019