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see halohalo,
in meteorology, short-lived circles or arcs, and less commonly spikes and crosses, of colored or whitish light surrounding the moon or sun or in clouds as seen from above.
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(also mock sun, sun dog), a bright circular spot seen in the sky either on one side or on both sides of the solar disk; it is a type of halo. Similar spots formed by lunar light are called paraselenae.


Either of two colored luminous spots that appear at points 22° (or somewhat more) on both sides of the sun and at the same elevation as the sun; the solar counterpart of the lunar paraselene. Also known as mock sun; sun dog.