Earth's shadow
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Earth's shadow is the shadow that Earth itself casts through its atmosphere and into outer space, toward the antisolar point. During the twilight period, the shadow's visible fringe – sometimes called the dark segment or twilight wedge – appears as a dark and diffuse band just above the horizon, most distinct when the sky is clear.
Earth's shadow (blue) and the Belt of Venus (pink) at dawn, seen above the Pacific Ocean (blue-grey), looking west from Twin Peaks, San Francisco
Earth's shadow and the Belt of Venus at dusk, looking east from the Marin Headlands just north of San Francisco in October 2010. (Note: A thin layer of greyish cloud partially obscures the horizon in this image.)
A full moon rising, as seen through the Belt of Venus. A very small part of the Earth's shadow (dark blue) is also visible in this image, but the horizon here is too high for more of the Earth's shadow to be seen.
A total lunar eclipse on May 15, 2022, shows the reddish light falling on the Moon's surface.
Shadow
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A shadow is a dark area where light from a light source is blocked by an object. It occupies all of the three-dimensional volume behind an object with light in front of it. The cross section of a shadow is a two-dimensional silhouette, or a reverse projection of the object blocking the light.
Shadows of visitors to the Eiffel Tower, viewed from the first platform
Park fence shadow is distorted by an uneven snow surface.
Shadows from cumulus clouds thick enough to block sunlight
Three moons (Callisto, Europa and Io) and their shadows parade across Jupiter.