A "Day" Isn't What It Used To Be

How we understand time with clocks is fundamentally different than the passage of cosmic time and this is mainly due to our time zones. Let's take a look at the history of timekeeping to see how these two concepts of time coexist in our lives.

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VIDEO ANNOTATIONS/CARDS

What is Dark Matter?
https://youtu.be/cncCu7iJE24
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RELATED YOUTUBE VIDEOS

How Earth Moves (Vsauce):
https://youtu.be/IJhgZBn-LHg

Weirdest Time Zones (RealLifeLore):
https://youtu.be/J1kOkoma_hM

Problems with Time Zones (Computerphile):
https://youtu.be/-5wpm-gesOY

Daylight Savings Time (It's Okay To Be Smart):
https://youtu.be/bMrb56dDpic

Daylight Savings Time (Trace Dominguez)
https://youtu.be/w6TtIMeBEvc
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OTHER SOURCES

Ian McNeil. (2002). An Encyclopedia of the History of Technology: Vol. Taylor & Francis e-Library ed. Routledge
https://www.census.gov/popclock/world
https://www.timeanddate.com/time/map/
https://www.jstor.org/stable/43523865
https://www.jstor.org/stable/1005923
https://www.scientificamerican.com/article/experts-time-division-days-hours-minutes/
https://physicsworld.com/a/a-brief-history-of-timekeeping/
https://www.scientificamerican.com/article/a-chronicle-of-timekeeping-2006-02/
https://www.sciencemuseum.org.uk/objects-and-stories/telling-time-sun
https://physics.nist.gov/time
https://www.loc.gov/rr/business/businesshistory/November/day-of-two-noons.html
https://multiverse.ssl.berkeley.edu/Calendar-in-the-Sky/Articles/Chinese-New-Year
https://openstax.org/books/astronomy/pages/4-2-the-seasons
https://eaae-astronomy.org/find-a-sundial/how-does-a-sundial-work
https://en.wikipedia.org/wiki/Equation_of_time
https://slate.com/news-and-politics/2014/02/how-wrong-is-your-time-zone-map-shows-how-far-world-clocks-are-from-solar-time.html
https://explainingscience.org/2015/08/24/september-18-the-shortest-day/
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LINKS TO COMMENTS

https://www.youtube.com/watch?v=cncCu7iJE24&lc=UgzyYE7GHIN1go_FaMR4AaABAg
https://www.youtube.com/watch?v=cncCu7iJE24&lc=UgwIgC1Ewtvh--z6oFd4AaABAg
https://www.youtube.com/watch?v=cncCu7iJE24&lc=Ugxn_bkuLin1NDprPYh4AaABAg
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IMAGE CREDITS

China Clock Tower:
https://commons.wikimedia.org/wiki/File:Clock_Tower_from_Su_Song%27s_Book_desmear.JPG

Moon Phases:
https://svs.gsfc.nasa.gov/4874

Time Zone Map:
https://www.cia.gov/the-world-factbook/maps/world-regional/

October 1582:
https://www.timeanddate.com/calendar/custom.html?year=1582&month=10&country=13&cdt=1&ft=404245_7e8ac48693176768a16cbe006a6613f4&typ=1&display=1&df=1

Earth's Terminator:
https://svs.gsfc.nasa.gov/11353
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TIME CODES

00:00 Cold Open
00:43 Clock time is meaningless
02:04 Ancient history of timekeeping
04:05 What is a day?
07:23 Modern history of timekeeping
10:19 Summary
12:18 Outro
12:46 Featured Comment

Видео A "Day" Isn't What It Used To Be канала The Science Asylum