The Royal Observatory, Greenwich is the home of Greenwich Mean Time and the Prime Meridian of the World, making it the official starting point for each new day and year. It is also home to London's only planetarium, the Harrison timekeepers and the UK's largest refracting telescope. It runs the annual Astronomy Photographer of the Year competition.

Collins Astronomy is the home of the bestselling annual Guides to the Night Sky, Night Sky Almanac and also publishes the Astronomy Photographer of the Year collection and other popular astronomy books.