From the viewpoint of the earth, a solar eclipse is happening in this image.
A solar eclipse is said to occur when the moon positions itself in-between the sun and the earth.
When this happens, a shadow of the moon is cast on the earth.
The parts of the earth where the shadow of the moon completely blocks light from the sun are called the umbra regions while the parts of the earth were the light from the sun is still partially visible are called the penumbra regions.
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