Scientists from around the world gathered in Rome on 2nd May 1922 to agree on a definitive list of 88 constellations, which up until then had been an astronomical free-for-all. The collection of eminent astronomers eventually settled on 42 animals, 29 inanimate objects and 17 humans or mythological characters, which, taken together, offered a complete map of the skies for the very first time. In this episode, Arion, Rebecca and Olly explain how different ancient civilisations around the world understood the heavens differently; marvel at the immense contribution of Ancient Greeks to contemporary astronomy; and discuss why Antinous, the boy lover of the Roman emperor Hadrian, is the greatest constellation no longer in use…  Further Reading: • ‘10 Constellations that Never Caught On’ (Mental Floss, 2010): https://www.mentalfloss.com/article/49454/10-constellations-never-caught  • ‘The Constellations’ (IAU, 2001): https://www.iau.org/public/themes/constellations/  • ‘Pictures in the sky: the origin and history of the constellations’ (The Royal Society, 2014): https://www.youtube.com/watch?v=nZm-QaKqS-Y&t=271s  #1920s #Space #Europe #Science This episode first aired in 2023 Love the show? Support us!  Join  🌴CLUB RETROSPECTORS🌴to DITCH THE ADS and get an additional full-length episode each SUNDAY…  … Plus, get weekly bonus bits, and unlock over 100 bits of extra content.  Join now with a free trial on Apple Podcasts or Patreon and support our show ❤️ The Retrospectors are Olly Mann, Rebecca Messina & Arion McNicoll, with Matt Hill. Theme Music: Pass The Peas. Announcer: Bob Ravelli. Graphic Design: Terry Saunders. Edit Producer: Ollie Peart Copyright: Rethink Audio / Olly Mann 2025. Learn more about your ad choices. Visit podcastchoices.com/adchoices