Ready for a Night In? Join Tabby and Kate as they talk about calendars and how they have played a significant role in our progression as a civilization.
00:45 Why does leap day exist? It's complicated
01:35 Calendar Intercalation: a day, week, or month added to a calendar to realign the lunar calendar with the solar calendar
01:55 Lunar Calendars start as civilizations first prehistoric calendar
02:45 Intercalations in the lunisolar calendar exist as months. This is necessary because the lunar calendar is 354 days long but a solar year is approx. 365 days long, so every few years a month was added to the lunisolar calendar to make up for the lost days that come from a lunar calendar
04:23 Calendar science leads to societies having many calendars
04:35 The Metonic Cycle was a 19-year cycle that included an intercalary month 7 times in a 19 year cycle to keep the average length of the year in 19 years approx. 265 days long
06:30 Mayan calendar
09:00 The Persian Calendar in the 11th century predicts the tropical year extremely accurately
09:41 The Gregorian calendar and why it replaced the Julian Calendar
13:30 Other cultures still maintain their lunisolar calendars for cultural traditions
16:55 The two types of lunar calendars
18:00 Bachelor’s Day
Thanks again for listening as always! Be sure to follow our social media! @Tylerandfrantz
Intro Song by: Joakim Karud youtube.com/joakimkarud
Additional music provided by the YouTube Audio Library
