Have you ever wondered how we ended up with the calendar we have today? Where leap years come from, and why we need them? This week we take a look at our modern calendar and the ancient calendars that came before it. January APN Membership Giveaway! Leave us a review on iTunes or on your platform of choice and get entered to win a 1 year APN membership! Here's the fine print: 1) Leave us a review on a podcast listening platform (iTunes, Spotify, wherever you listen!). 2) Each review counts as an entry so feel free to review on all the platforms! 3) YOU MUST Email us your name and where you did the review(s). Otherwise we don't know you did it! Chris@archaeologypodcastnetwork.com We will announce the winner in February, and thanks in advance for all the reviews!! Links * Gregorian Calendar from WhatIs.com [https://www.techtarget.com/whatis/definition/Gregorian-calendar] * What years are leap years? From Government of Canada [https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/what-years-are-leap-years] * Leap Year [https://scienceworld.wolfram.com/astronomy/LeapYear.html] * Julian Calendar from Britannica  [https://www.britannica.com/science/Julian-calendar] * Roman republican calendar from Britannica [https://www.britannica.com/science/Roman-republican-calendar] * Greek Calendar overview from Oxford Reference [https://www.oxfordreference.com/display/10.1093/oi/authority.20110803095542625;jsessionid=CAB34803013465C1916FCC8F7F4B81F7] * The Sumerian Calendar from Projeda [http://www.projectglobalawakening.com/sumerian-calendar/] * Mayan Calendar from Live Science) [how-mayan-calendar-works.html">https://www.livescience.com/25662-how-mayan-calendar-works.html] * Mayan Calendar [https://www.mayaarchaeologist.co.uk/public-resources/maya-world/maya-calendar-system/] Contact * Chris Webster chris@archaeologypodcastnetwork.com * Rachel Roden rachel@unraveleddesigns.com RachelUnraveled (Instagram) [https://www.instagram.com/rachelunraveled/] ArchPodNet * APN Website: https://www.archpodnet.com [https://www.archpodnet.com/] * APN on Facebook: https://www.facebook.com/archpodnet * APN on Twitter: https://www.twitter.com/archpodnet * APN on Instagram: https://www.instagram.com/archpodnet * Tee Public Store [https://www.teepublic.com/stores/archaeology-podcast-network?ref_id=5724] Affiliates * Wildnote [http://www.wildnoteapp.com/] * TeePublic [https://www.teepublic.com/?ref_id=5724&ref_type=aff] * Timeular [https://timeular.com/ref/chriswebster/] * Motion [https://www.archpodnet.com/motion]