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We've all learned it takes 24 hours for the Earth to rotate once on its axis but that isn't the whole story at all. We have come a long way over the course of human civilization.

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Previous Series:

Why The Gemini Space Program Revolutionized Space Travel: [ Ссылка ]

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Sources:

Why Does The Earth Spin?:
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“In a classic episode of this video series, I did the calculations for how fast the Earth is spinning. We know the Earth is rotating, but why? Why is it spinning?"

The First Point of Aries:
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“In astronomy, we need a celestial coordinate system for fixing the positions of all celestial bodies in the celestial sphere."

How Long Is A Day? How Long Does It Take The Earth To Spin Once On Its Axis?:
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“It might seem obvious that the answer to both these questions is 24 hours. But the correct answer is not quite so straight forward. The Earth's axis always points in the same direction relative to the distant stars, at least to a good approximation."

9 Things You May Not Know About the Ancient Sumerians:
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“Sometime around 4000 B.C., ancient Sumerian culture emerged on a sun-scorched floodplain along the Tigris and Euphrates rivers in what is now southern Iraq."

Sumer:
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“Sumer, site of the earliest known civilization, located in the southernmost part of Mesopotamia between the Tigris and Euphrates rivers, in the area that later became Babylonia and is now southern Iraq from around Baghdad to the Persian Gulf."

Why Are There 24 Hours In A Day?:
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“While each country has (in broad terms) historically had distinct measurements for distance, weights etc the method of splitting the day into 24 hours, one hour into 60 mins and one minute into 60 seconds seems to be the only one in use, and indeed to me the only one I know of. "

Keeping Time: Why 60 Minutes?:
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“How did we come to divide the hour into 60 minutes and the minute into 60 seconds? These smaller divisions of time have been in practical use for only about 400 years, but they were vital to the advent of modern science."

Why Is A Minute Divided Into 60 Seconds, An Hour Into 60 Minutes, Yet There Are Only 24 Hours In A Day?:
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“In today's world, the most widely used numeral system is decimal (base 10), a system that probably originated because it made it easy for humans to count using their fingers."

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DNews Plus is built for enthusiastic science fans seeking out comprehensive conversations on the geeky topics they love. Host Trace Dominguez digs beyond the usual scope to deliver details, developments and opinions on advanced topics like AI, string theory and Mars exploration. DNews Plus is also offered as an audio podcast on iTunes.

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