June 25, 2026
Somewhere above you, light is arriving from places so distant their names feel like poetry.
Anticrepuscular Rays over Sicily
Birthday · June 25, 2026
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APOD published June 25, 2026. Credit: Marcella Giulia Pace Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II). A publication-date match, not a photo taken on your date. Independent of NASA.
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.
Image credit: Marcella Giulia Pace Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)