A classic returns – 40 odd years ago someone dragged me outside one freezing winter afternoon to look at a halo display. I remember (I’m sure memory has hyped it up) magnificent arcs everywhere, each finely scribed across a milky blue sky. They were my very first ice-halos. I was hooked! But, how to find out their names? How they formed and more about them without the web? A search of bookshops unearthed Robert Greenler’s book “Rainbows, Halos, and Glories” – now a venerated classic by one of the fathers of atmospheric optics. It was pure gold. It got me going on all things optical up there and it’s inspired so many others to look up and search the skies. It’s sadly been unavailable for years but Bob, now a friend and colleague, tells me its back. More about it at – https://spie.org/Publications/Book/2573016?SSO=1
