On Friday, July 10, 2015 at 9:39:02 AM UTC-7, Jeff Liebermann wrote:
"Why are there 24 hours in a day?"
http://www.abc.net.au/science/articles/2011/11/15/3364432.htm
The ancient Egyptians apparently were on a decimal system but
got derailed by a special interest faction in their standards
committee that favored a 12 hr day. At least they tried.
I would give the blame/credit to the Babylonians.

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Jeff Liebermann
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The Babylonians got it from some alien astronauts who had six fingers on each hand and six toes on each foot. It must be true. I read it on the internet.