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Sunrise at Copernicus Crater Image Credit & Copyright: Sage Gray Explanation: A prominent impact siteanchored in the lunar Oceanus Procellarum, Copernicus crater is at the centerof this telescopic portrait in light and shadow. Caught in stacked andsharpened video frames recorded on April 14 at 3:30am UTC, the lunarterminator, or boundary between night and day, cuts across the middle of the 93kilometer diameter crater. Sunlight is just beginning to strike its tallwestern walls but doesn't yet shine on lower terrain nearby, briefly extendingthe crater's outline into the lunar nightside. At that moment standing atCopernicus crater you could watch the sunrise, an event that happens atCopernicus every 29.5 days. Of course that corresponds to a lunar month or alunation, the time between consecutive Full Moons as seen from planet Earth. 哥白尼环形山的日出 说明：哥白尼环形山是月球风暴洋平原的一个著名撞击点，它位于这幅由望远镜拍摄的影像中央。这幅照片拍摄于4月14日凌晨3点30分，是由多张照片叠加而成的，月球的明暗界线（昼夜分界线）从直径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之上，但还没有照到附近较低的地带，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，在哥白尼环形山，每29.5天会发生一次。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两次满月之间的时间。 参考文献： https://apod./apod/image/1905/SunriseCopernicus.jpg 近期文章： Astronomy Picture of the Day——M95：带内环的旋涡星系 |
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