Karachiites witness mesmerising halo around sun

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KARACHI: People in different parts of Sindh, including Karachi, witnessed a mesmerising halo formed around the sun on Saturday (today). According to meteorological analyst Jawad Memon, the coloured circles formed around the sun are called sun halos. Memon said halos, which are formed by light passing through ice crystals in the upper atmosphere, usually appear near sun or moon. According to the UK-based Atmospheric Optics, a knowledge-sharing website, the halo phenomenon happens when the light is reflected and refracted by ice crystals and may split into colours because of dispersion. Reports suggest that usually, halo indicates that rain will fall within the next 24 hours since the cirrostratus clouds that cause them can signify an approaching frontal system. DNA