Скачать или смотреть Why Do We Divide the Day Into Seconds, Minutes, and Hours?

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In this video:

The concept of needing to divide up the day seems second nature to even the smallest kid who asks, “is it snack time”. The reality is, even though we’ve decided that there is a need to divide up time, the actual process and the way we go about it has been changing for millennia. The cruel irony is that even though we know we need to measure time, there has never been a consensus on what time really is.

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Sources:

http://www.scientificamerican.com/art...
http://en.wikipedia.org/wiki/Time
http://en.wikipedia.org/wiki/Gregoria...
http://en.wikipedia.org/wiki/Horology
http://en.wikipedia.org/wiki/Escapement
http://en.wikipedia.org/wiki/Second
http://en.wikipedia.org/wiki/Hour
http://en.wikipedia.org/wiki/Minute
http://allwomenstalk.com/wp-content/u...