Have you ever taken a walk on a winter's day to find the sun flanked by two bright companions?
, though this isn't the definitive origin of the name. The name may reflect the belief that as Zeus the father of all gods and the god of the sky in Greek mythology, walked his dogs through the sky they often appeared as companions to the sun as two"false suns."Sundogs are formed when light passes through hexagonal plate crystals of ice, suspended in cirrus or cirrostratus clouds located at altitudes of around 20,000 feet and higher, up to 40,000 feet .
Taking these two refractions causes the sunlight to deviate by at least 22 degrees depending on the angle at which it entered the ice crystal, according to science site. This causes light to ring the sun at a distance of 22degrees as sun-haloes. When the light is concentrated as spots next to the sun. also separated by 22 degrees it appears as sundogs.
This happens because the degree at which light is refracted when passes through a medium, in this case, the ice crystal, is refracted depends on its frequency. The variation is called the index of refraction.
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