四座高楼与春分月
影像来源与版权:Javier Martinez Moran

说明:在这张telescopic长焦镜头影像里,北半球春天的第一个满月,从远处四座高楼的后方升起。在这幅摄于西班牙马德里市西方约40公里处的影像里,这次的月出,也恰好集结了满相、发生在近地点和春分等特色。这轮在地平线附近的满月,其波折的边缘和扭曲的形状,是因为长长的视线穿过层状的大气所致。其中由大气折射所造成的效应,包括紧贴在月盘上方的一抹纤薄银白。这种精采的光学蜃影,其成因和较常见的落日绿闪雷同。
翻译:“每日一天文图”成大物理分站

Four Towers and the Equinox Moon
Image Credit & Copyright: Javier Martinez Moran

Explanation: The first Full Moon of northern spring rises behind four distant towers in this telescopic view. In an image captured from some 40 kilometers west of the city of Madrid, this moonrise also represents a near coincidence of the full lunar phase with lunar perigee and the March equinox. Close to the horizon, the Full Moon’s strangely rippled and distorted shape has more to do with the long sight-line through a layered atmosphere, though. Tantalizing visible effects of the substantial atmospheric refraction include the appearance of a thin floating sliver just above the lunar disk. The remarkable optical mirage is related to the more commonly witnessed green flash of the setting Sun.
Astronomy Picture of the Day 03/23/2019