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When the Moon is low in the sky, a bright “false Moon” (a well-defined saucer of brilliant moonlight) may hover off to its side. This is known as a Moon dog!
What is a Moon Dog?
Sometimes, these “saucers” are distinct bright spots attached to a halo around the Moon at a point 22° to its right or left—or both sides at once. Often, however, they may seem to appear without the halo.
By day, with the Sun, one of these phenomena is called a parhelion, or sun dog. By night, it is called a paraselene, or Moon dog.