Astronomy Picture of the Day——瑞典山脉远处的凸月
Gibbous Moon beyond Swedish Mountain
Image Credit & Copyright: Göran Strand
Explanation: This is a gibbous Moon. MoreEarthlings are familiar with a full moon, when the entire face of Luna is litby the Sun, and a crescent moon, when only a sliver of the Moon's face is lit.When more than half of the Moon is illuminated, though, but still short of fullillumination, the phase is called gibbous. Rarely seen in television andmovies, gibbous moons are quite common in the actual night sky. The featuredimage was taken in Jämtland, Sweden near the end of last month. That gibbousmoon turned, in a few days, into a crescent moon, and then a new moon, thenback to a crescent, and a few days ago back to gibbous. And this same gibbousmoon is visible again tonight, leading up to the Full Beaver Moon that occursFriday night. Setting up to capture a picturesque gibbous moonscape, thephotographer was quite surprised to find an airplane, surely well in theforeground, appearing to fly past it.
瑞典山脉远处的凸月
这是一轮凸月。大多数人都对满月比较熟悉，月亮的整个表面被太阳照亮。而新月是月球表面只有一小部分被照亮。然而，当超过一半月球表面被照亮，但月面仍未被整个照射到，此时的月相被称为凸月。在电视和电影中很少看到的凸月的镜头，但在现实的夜空中它却很常见。这幅特征图像是上个月底拍摄于瑞典的耶姆特兰省。那轮凸月在几天之后变成了蛾眉月，然后再变成新月，接着又变回蛾眉月，几天前又回到凸月。今晚，同样的凸月再次可见，在星期五晚上将出现满月——“海狸月”。当摄影师调好设备准备拍摄一幅美丽的凸月景象时，他很惊讶地发现了一架飞机，它在前景中，看似正飞过月球。
参考文献：
https://apod.nasa.gov/apod/image/1811/GibbousMoon_Strand_1500.jpg
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Astronomy Picture of the Day——M13内恒星的颜色与星等图