A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC A - - PowerPoint PPT Presentation

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A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC A - - PowerPoint PPT Presentation

Sep 08, 2022 296 likes •1.05k views

A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC SUMMER SOLSTICE! LONGEST DAY! It all started with.. https://eksisozluk.com/entry/14623890 `

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A Brief History of Timekeeping

Kivanc Yazan 6/21/2017 TPC

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A Brief History of Timekeeping

Kivanc Yazan 6/21/2017 TPC

SUMMER SOLSTICE! LONGEST DAY!

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It all started with..

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https://eksisozluk.com/entry/14623890

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https://eksisozluk.com/entry/14623890 `

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https://metacpan.org/pod/WWW::Eksi

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https://metacpan.org/pod/WWW::Eksi `

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Runtime error: Invalid local time for date in time zone: Europe/Istanbul

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Runtime error: Invalid local time for date in time zone: Europe/Istanbul

Kivanc Yazan 6/21/2017 TPC

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  • Why do we need Daylight Saving?
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  • Why do we need Daylight Saving?
  • Which one is noon/midnight: 12AM/12PM??
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  • Why do we need Daylight Saving?
  • Which one is noon/midnight: 12AM/12PM??
  • How can we have so accurate time?
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  • Why do we need Daylight Saving?
  • Which one is noon/midnight: 12AM/12PM??
  • How can we have so accurate time?
  • Any alternative ways to measure time?
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  • Why do we need Daylight Saving?
  • Which one is noon/midnight: 12AM/12PM??
  • How can we have so accurate time?
  • Any alternative ways to measure time?
  • Time in space?
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A Brief History of Timekeeping

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A Brief [Chronological] History of Timekeeping

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It all started with..

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13.7B years ago

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https://news.ycombinator.com/item?id=14568468

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https://news.ycombinator.com/item?id=14568468

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Sun = 5Ba Earth = 4.5Ba Moon = 4.5B - 13M a

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https://spacemath.gsfc.nasa.gov/earth/6Page58.pdf

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https://spacemath.gsfc.nasa.gov/earth/6Page58.pdf

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https://en.wikipedia.org/wiki/Template:Human_timeline Hopkin, Michael (2005-02-16). "Ethiopia is top choice for cradle of Homo sapiens". Nature News. doi:10.1038/news050214-10. Karmin, Monika et al. (April 2015). "A recent bottleneck of Y chromosome diversity coincides with a global change in culture". Genome Research. 25 (4): 459–466. PMC 4381518 Freely accessible. PMID 25770088. doi:10.1101/gr.186684.114.

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https://spacemath.gsfc.nasa.gov/earth/6Page58.pdf

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15_000 BC

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http://news.bbc.co.uk/2/hi/science/nature/975360.stm

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1_500 BC

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http://www.wijzerweb.be/egypteengels.html Website Verein zur Förderung des Agyptischen Museums Berlin

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http://www-history.mcs.st-and.ac.uk/Diagrams/Mintz_2.jpeg

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Vodolazhskaya, Larisa. "Reconstruction of vertical and L-shaped ancient Egyptian sundials and methods for measuring time." arXiv preprint arXiv:1408.0987 (2014).

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284 days of sundial uptime at California

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750 BC

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https://en.wikipedia.org/wiki/Roman_calendar

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https://en.wikipedia.org/wiki/Roman_calendar

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300 BC on

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Avg temp above freezing point year round at California

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46 BC Julian Calendar

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https://metacpan.org/pod/DateTime

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13th century Mechanical clocks

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1525 Fusee

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1582

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1759 Grasshopper

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1784 Royal Mail

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1792

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1848 Railroad GMT

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1883 US

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1884 Prime Meridian

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1908

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1927

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1949 First Atomic Clock

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1967 Second redefined

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1984

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https://github.com/eggert/tz/commit/68b02c7b1464af59ca5f17c38b33d8afe781ce3b

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1998 Swatch internet time

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Thanks!

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Quick reads: https://en.wikipedia.org/wiki/History_of_calendars https://en.wikipedia.org/wiki/History_of_timekeeping_ devices Longer reads: