西西里岛上空的反气旋射线
(原标题: Anticrepuscular Rays over Sicily)
2026-06-25
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太阳刚刚落山……在天空的另一边。在意大利西西里岛东南部海布拉恩山脉中心的石灰岩高原上，反反射光明显地向东汇聚。如果没有太阳，这些反反射光是如何形成的？太阳下山后（像往常一样在西边），它的光仍然照亮了天空中更高的一片云。阳光被云层挡住了一部分，产生了光和影的图案，以平行线穿过天空。从透视的角度看，它们似乎在东方汇聚，就像火车轨道在远处相交一样。日出时也会发生这种效果，只是方向发生了交换。在极少数情况下，可以同时看到黄昏和反黄昏光线。
查看原文解释
The Sun has just set... in the opposite side of the sky. Pictured here are anticrepuscular rays apparently converging in the east in this image of the limestone plateau in the heart of the Hyblaean Mountains of southeastern Sicily, in Italy. How were these anticrepuscular rays formed, if the Sun wasn't there? After the Sun set (in the west, as usual) its light still illuminated a cloud higher up in the sky. Partially blocked by the cloud, the sunlight produced patterns of light and shadow, crossing the sky in parallel lines. Perspective makes it look like they converge in the east, in the same way that train tracks appear to meet in the distance. This effect can also happen at sunrise, only the directions are exchanged. In rare cases, both crepuscular and anticrepuscular rays can be seen at the same time.
© Marcella Giulia Pace Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)