1. How to photograph earth’s shadow

    Did you know that the earth has a shadow just like you and most everything else? Let’s find earth’s shadow, take its picture and find out what it tells us about the sky.

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    How to photograph earth’s shadow

    You can see earth's shadow every night, for the dark sky is the shadow of the earth on the sky overhead. When earth’s shadow covers the moon, a lunar eclipse occurs. The image above shows the scenic edge of earth's shadow in the western sky just before the sun rises over the eastern horizon. The image was captured by a digital camera at Hawaii's Mauna Loa Observatory (elevation 3,397 meters or 11,145 feet). Earth's shadow is the dark blue-gray layer below the pink band across the sky.

    The pink band is known as the antitwilight glow since it is opposite the twilight glow over the sunrise or sunset. If the horizon is very open, the antitwilight glow forms a gentle arch over one-third or more of the horizon. Besides its beautiful appearance, the edge of earth’s shadow just before sunrise and just after sunset provides information about the clarity (clearness) of the sky. In this project you will use your eyes to observe and a camera to record the edge of earth’s shadow in the antitwilight glow.

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