Today I Found Out
How Did People Know When To Get Up in the Morning Before Alarm Clocks? (2019x103)
Exibido em:: Abr 22, 2019
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In this video:
As much as we hate the alarm that drags us from sleep to face the day, it is hard to imagine how people organized themselves and their collective activities before the invention and widespread use of mechanical or digital clocks. Clever and adaptable, we humans actually seem to have managed rather easily by relying on simple methods, some of which we still see in our timekeeping today.
Want the text version?: http://www.todayifoundout.com/index.php/2015/02/telling-time-clocks/
Sources:
http://mentalfloss.com/article/24117/7-ways-people-woke-pre-alarm-clock
http://clockhistory.com/alarmClockHistory/
http://www.historyworld.net/wrldhis/PlainTextHistories.asp?groupid=1244
http://en.wikipedia.org/wiki/History_of_sundials
http://en.wikipedia.org/wiki/History_of_timekeeping_devices#Mechanical_clocks
http://www.theguardian.com/notesandqueries/query/0,5753,-19046,00.html
http://en.wikipedia.org/wiki/Salisbury_cathedral_clock
http://www.dl.ket.org/latin3/mores/techno/time/tellingtime.htm
http://hea-www.harvard.edu/ECT/Daymarks/
http://www.scientificamerican.com/article/experts-time-division-days-hours-minutes/
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