![]() ![]() Garrison in Idaho caught the November 14, 2016, supermoon. For example, there are major differences in halo frequencies and types of halos across even 200 miles in the U.K. Their frequency depends on the frequency of cirrus coverage and whether it has had a history such that it contains halo forming crystals. (b) Halos can occur anywhere on the planet during winter or summer. Obviously (a) halos only occur in polar regions or countries with very cold winters (Canada for example is not high latitude). We need to distinguish between (a) halos formed by low level diamond dust during very cold weather and (b) halos formed by ice crystals in high cirrus cloud. That’s a good question that is not easy to answer accurately because no halo frequency statistics are collected except in one or two mid-latitude European countries. We asked Les Cowley of the website Atmospheric Optics if halos around the sun and moon are more frequently seen at high latitudes and less commonly seen closer to the equator. But it does have a nice illusion of an odd-shaped halo then becoming round.” Are halos more common at high latitudes? ![]() Although it appears the halo is forming from an odd shape, what is actually illuminated is the edge of the clouds just before the halo formed as the clouds drifted in front of the moon. It then persisted for about 40 minutes and disappeared with increasing clouds. Eliot Herman wrote on May 5, 2018: “This shows the change that occurred over 7 minutes as a lunar halo emerged. Never look directly at the sun, even when it is visible through clouds. Pointing a camera directly at the unobscured sun can damage it. Take care when photographing solar halos. 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. That’s why, like rainbows, halos around the sun – or moon – are personal. The crystals have to be oriented and positioned just so with respect to your eye, in order for the halo to appear. 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. These clouds contain millions of tiny ice crystals. And yet halos are a sign of high, thin cirrus clouds drifting 20,000 feet (6 km) or more above our heads. Notice in these photos that the sky looks fairly clear. There’s truth to this saying, because high cirrus clouds often come before a storm. There’s an old weather saying: ring around the moon means rain soon. They bear this name because the radius of the circle around the sun or moon is approximately 22 degrees. We get many messages throughout each year from people who’ve just spotted a large ring or circle of light around the sun or moon. | Anubha Singh in Hyderabad, India caught this beautiful 22-degree halo around the sun on June 2, 2021. ![]()
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