The first 100 people to go to https://www.blinkist.com/geographics are going to get unlimited access for 1 week to try it out. You'll also get 25% off if you want the full membership. The 7-day trial is completely free, and you can cancel at any time during that period. → Subscribe for new videos two times per week. https://www.youtube.com/channel/UCHKRfxkMTqiiv4pF99qGKIw Love content? Check out Simon's other YouTube Channels: Biographics: https://www.youtube.com/channel/UClnDI2sdehVm1zm_LmUHsjQ MegaProjects: https://www.youtube.com/channel/UC0woBco6Dgcxt0h8SwyyOmw SideProjects: https://www.youtube.com/channel/UC3Wn3dABlgESm8Bzn8Vamgg Casual Criminalist: https://www.youtube.com/channel/UCp1tsmksyf6TgKFMdt8-05Q Today I Found Out: null TopTenz: null Highlight History: https://www.youtube.com/channel/UCnb-VTwBHEV3gtiB9di9DZQ XPLRD: https://www.youtube.com/channel/UCVH8lH7ZLDUe_d9mZ3dlyYQ Business Blaze: https://www.youtube.com/channel/UCYY5GWf7MHFJ6DZeHreoXgw This video is #sponsored by Blinkist. Source/Further reading: History, overview: https://www.history.com/news/a-brief-history-of-halleys-comet-sightings  NASA, 1P/Halley in-depth: https://solarsystem.nasa.gov/asteroids-comets-and-meteors/comets/1p-halley/in-depth/  UK Space Center: https://spacecentre.co.uk/blog-post/halleys-comet-shaped-history/  Britannica: https://www.britannica.com/topic/Halleys-Comet  In Our Time podcast on comets (with some details on Halleys): https://www.bbc.co.uk/programmes/b01pw38n  io9 - Halley’s comet through history: https://io9.gizmodo.com/how-halleys-comet-sightings-changed-history-over-the-pa-5637815  Halley’s influence on early-modern astronomy: https://doi.org/10.1093/ref:odnb/92735  Edmond Halley, in-depth biography: https://doi.org/10.1093/ref:odnb/12011  Scientific American: https://www.scientificamerican.com/article/in-the-path-of-halleys-comet-humanity-might-find-its-way-forward1/  Comet Panic of 1910: https://astronomy.com/news/2020/10/halleys-comet-covid-19-and-the-history-of-miracle-anti-comet-remedies   Modern comet list (constantly updating): https://physics.ucf.edu/~yfernandez/cometlist.html#hf