22º Halo

If you’re in the Galway area and you looked up to the sky around lunchtime yesterday you might have seen a big ring around the sun and wondered what was causing it. I asked NUI Galway’s Iain Mac Labhrainn, mostly because he’s got a degree in astrophysics and a PhD in cosmology. I’m going to add here, that I have previously relayed my children’s questions to him like “What came before the Big Bang” and he always gives me a reliable answer.

Today was no exception. According to Iain this is an example of a 22 degree halo around the sun caused by hexagonal ice crystals in the atmosphere. You can read about it on Wikipedia here:
https://en.wikipedia.org/wiki/22°_halo

If you saw it too, tweet us your photos to @NatureAtHomeIE

Published by Louise Allcock

Professor of Zoology at NUI Galway

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