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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 `

  1. A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC

  2. A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC SUMMER SOLSTICE! LONGEST DAY!

  3. It all started with..

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

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

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

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

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

  9. Runtime error: Invalid local time for date in time zone: Europe/Istanbul Kivanc Yazan 6/21/2017 TPC

  10. ● Why do we need Daylight Saving?

  11. ● Why do we need Daylight Saving? ● Which one is noon/midnight: 12AM/12PM??

  12. ● Why do we need Daylight Saving? ● Which one is noon/midnight: 12AM/12PM?? ● How can we have so accurate time?

  13. ● 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?

  14. ● 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?

  15. A Brief History of Timekeeping Kivanc Yazan 6/21/2017 TPC

  16. A Brief [Chronological] History of Timekeeping Kivanc Yazan 6/21/2017 TPC

  17. It all started with..

  19. 13.7B years ago

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

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

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

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

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

  25. 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.

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

  27. 15_000 BC

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

  29. 1_500 BC

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

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

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

  34. 284 days of sundial uptime at California

  35. 750 BC

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

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

  38. 300 BC on

  40. Avg temp above freezing point year round at California

  43. 46 BC Julian Calendar

  44. https://metacpan.org/pod/DateTime

  45. 13th century Mechanical clocks

  48. 1525 Fusee

  50. 1582

  52. 1759 Grasshopper

  54. 1784 Royal Mail

  56. 1792

  58. 1848 Railroad GMT

  59. 1883 US

  61. 1884 Prime Meridian

  62. 1908

  65. 1927

  67. 1949 First Atomic Clock

  69. 1967 Second redefined

  70. 1984

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

  72. 1998 Swatch internet time

  74. Thanks!

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

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