Earth Shadow
Have you ever seen those layers of blue, purple and pink along the horizon just before sunrise? The darker sky, lowest on the horizon, is actually the shadow of the Earth cast upon the atmosphere, while the lighter sky above is the atmosphere as it is lit by the sun. As dawn nears, the shadowed portion of the sky is squeezed down on the horizon and disappears. The pink in the upper “layer” is the result of the sun passing at a highly oblique angle through the dust-filled atmosphere to the east, colored by the particulate suspended in the air.
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| Earth shadow over Morro Rock and Morro Bay. Just before sunrise the shadow of the Earth can seen as the darker sky below the pink sunrise. Morro Bay, California, USA. Image: 22213 Location: Morro Bay, California, USA View this Image in Google Earth! |
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Updated: March 22, 2010













