Gavin Pretor-Pinney. Photo: Bill Bradshaw

Gavin Pretor-Pinney is the founder of the Cloud Appreciation Society (CAS), which aims to foster understanding and appreciation of clouds, and has over 50,000 members worldwide from 120 different countries. He has also written several books, among them The Cloudspotter’s Guide, The Cloud Collector’s Handbook and, most recently, A Cloud A Day.

Melanie has joined several of the society’s trips to speak about the aurora and eclipses, ironically both phenome...