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What makes a halo around the sun or moon? There’s an old weather saying: ring around the moon means rain soon. There’s truth to this saying, because high cirrus clouds often come before a storm. Notice in these photos that the sky looks fairly clear. After all, you can see the sun or moon. And yet halos are a sign of high thin cirrus clouds drifting 20,000 feet or more above our heads. These clouds contain millions of tiny ice crystals. The halos you see are caused by both refraction, or splitting of light, and also by reflection, or glints of light from these ice crystals. The crystals have to be oriented and positioned just so with respect to your eye, in order for the halo to appear. That’s why, like rainbows, halos around the sun – or moon – are personal. Everyone sees their own particular halo, made by their own particular ice crystals, which are different from the ice crystals making the halo of the person standing next to you.
originally posted by: Indigent
Early this Tuesday a solar halo was visible over the capital of Venezuela.
This is the first time i heard of this in the country, I always thought they form on winter mostly, and Venezuela is not specially known for being a winter country, with its proximity to the equator and all, but hey good to know that even as the surface is scorching at a comfortably 42C, there is some ice up there...
On a side note some of my superstition prone countrymen express fear and concern over the completly natural and well known natural fenomena #proudtobeVenezuelan