El fenómeno conocido como parhelio, parhelia o parahelio es un fenómeno óptico asociado con la reflexión/refracción de la luz, producto de una gran cantidad de partículas de hielo en las nubes cirro. Muy parecidos a los halos (de hecho pueden y suelen suceder al mismo tiempo), se manifiestan alrededor de 22º a la izquierda o derecha del sol como manchas brillantes y hasta coloridas en el cielo.

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Sun dogs (or sundogs), mock suns or phantom suns, meteorological name parhelia (singular parhelion), are an atmospheric phenomenon that consists of a pair of bright spots on either horizontal side on the Sun, often co-occurring with a luminous ring known as a 22° halo. Sun dogs are a member of a large family of halos, created by light interacting with ice crystals in the atmosphere. Sun dogs typically appear as two subtly colored patches of light to the left and right of the Sun, approximately 22° distant and at the same elevation above the horizon as the Sun. They can be seen anywhere in the world during any season, but they are not always obvious or bright. Sun dogs are best seen and are most conspicuous when the Sun is close to the horizon.

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